diff --git a/common/components/filters.py b/common/components/filters.py
index 1b7f987..f95270b 100644
--- a/common/components/filters.py
+++ b/common/components/filters.py
@@ -93,6 +93,19 @@ def _parse_bool(existing: dict, key: str) -> bool:
 
 _FILTER_PREFETCH = 20
 
+# Presence modifiers drive the pinned (Any)/(None) pseudo-options (they clear the
+# value set); every other modifier is a match mode for the include set.
+_PRESENCE_MODIFIERS = frozenset({"NOT_NULL", "IS_NULL"})
+
+# Include-set match modes (Stash's any/all/none axis). Offered only for
+# many-to-many fields, where INCLUDES_ALL ("related to all of these") is
+# meaningful — a single-valued field can never match all of several values.
+_MATCH_MODES: list[LabeledOption] = [
+    ("INCLUDES", "any"),
+    ("INCLUDES_ALL", "all"),
+    ("EXCLUDES", "none"),
+]
+
 
 def _modifier_options(nullable: bool) -> list[LabeledOption]:
     """Pinned (Any)/(None) pseudo-options; (None) only when the field is nullable."""
@@ -102,37 +115,75 @@ def _modifier_options(nullable: bool) -> list[LabeledOption]:
     return options
 
 
+def _split_modifier(
+    modifier: str, match_modes: list[LabeledOption] | None
+) -> tuple[str, str]:
+    """Split a stored modifier into ``(presence_modifier, match_mode)``.
+
+    A criterion stores a single ``modifier``, but the widget surfaces it on two
+    orthogonal controls: the pinned (Any)/(None) presence pseudo-options and the
+    match-mode select. Presence modifiers (NOT_NULL/IS_NULL) route to the former;
+    the rest (INCLUDES/INCLUDES_ALL/EXCLUDES) to the latter. The match mode is
+    irrelevant when the field has no match-mode control, and falls back to the
+    first offered mode otherwise.
+    """
+    default_match = match_modes[0][0] if match_modes else ""
+    if modifier in _PRESENCE_MODIFIERS:
+        return modifier, default_match
+    if modifier and match_modes:
+        return "", modifier
+    return "", default_match
+
+
 def _enum_filter(
     field_name: str, options, choice: FilterChoice, *, nullable
 ) -> SafeText:
-    """A FilterSelect over a small, fully pre-rendered option set (enum field)."""
+    """A FilterSelect over a small, fully pre-rendered option set (enum field).
+
+    Enum fields are single-valued, so no match-mode control (any/all/none is
+    meaningless); only the presence modifier is surfaced.
+    """
     options_str = [(str(value), label) for value, label in options]
-    included = [(value, _find_label(options_str, value)) for value, _label in choice.selected]
-    excluded = [(value, _find_label(options_str, value)) for value, _label in choice.excluded]
+    included = [
+        (value, _find_label(options_str, value)) for value, _label in choice.selected
+    ]
+    excluded = [
+        (value, _find_label(options_str, value)) for value, _label in choice.excluded
+    ]
+    presence, _match = _split_modifier(choice.modifier, None)
     return FilterSelect(
         field_name=field_name,
         options=options_str,
         included=included,
         excluded=excluded,
-        modifier=choice.modifier,
+        modifier=presence,
         modifier_options=_modifier_options(nullable),
     )
 
 
 def _model_filter(
-    field_name: str, choice: FilterChoice, *, search_url, nullable
+    field_name: str,
+    choice: FilterChoice,
+    *,
+    search_url,
+    nullable,
+    match_modes: list[LabeledOption] | None = None,
 ) -> SafeText:
     """A FilterSelect backed by a search endpoint.
 
     Labels are embedded in the filter JSON (Stash-style), so pills render
-    directly from ``choice`` with no DB round-trip.
+    directly from ``choice`` with no DB round-trip. Pass ``match_modes`` for
+    many-to-many fields to surface the any/all/none match-mode select.
     """
+    presence, match = _split_modifier(choice.modifier, match_modes)
     return FilterSelect(
         field_name=field_name,
         included=[(value, label or value) for value, label in choice.selected],
         excluded=[(value, label or value) for value, label in choice.excluded],
-        modifier=choice.modifier,
+        modifier=presence,
         modifier_options=_modifier_options(nullable),
+        match=match,
+        match_modes=match_modes or [],
         search_url=search_url,
         prefetch=_FILTER_PREFETCH,
     )
@@ -804,6 +855,9 @@ def PurchaseFilterBar(
                         game_choice,
                         search_url="/api/games/search",
                         nullable=False,
+                        # games is many-to-many on Purchase: "all" (INCLUDES_ALL)
+                        # means a purchase linked to every selected game.
+                        match_modes=_MATCH_MODES,
                     ),
                 ),
                 _filter_field(
diff --git a/common/components/search_select.py b/common/components/search_select.py
index ec7dab5..71b7a07 100644
--- a/common/components/search_select.py
+++ b/common/components/search_select.py
@@ -101,6 +101,14 @@ _FILTER_ACTION_BUTTON_CLASS = (
 _FILTER_MODIFIER_ROW_CLASS = (
     "px-2 py-1 text-sm text-body hover:bg-neutral-secondary-strong cursor-pointer"
 )
+# The match-mode <select> (any/all/none → INCLUDES/INCLUDES_ALL/EXCLUDES). A
+# native control so its value *is* its state — no class toggling in the JS.
+# shrink-0 keeps it from collapsing as pills wrap; it sits before the pills.
+_FILTER_MATCH_SELECT_CLASS = (
+    "shrink-0 rounded border border-default-medium bg-neutral-secondary-medium "
+    "text-xs text-body px-2 py-0.5 cursor-pointer "
+    "focus:ring-brand focus:border-brand"
+)
 
 
 def _normalize_option(option) -> SearchSelectOption:
@@ -159,6 +167,7 @@ def _combobox_shell(
     always_visible: bool,
     items_visible: int,
     templates: list[SafeText] | None = None,
+    leading: SafeText | None = None,
 ) -> SafeText:
     """Assemble the shared, domain-agnostic combobox skeleton.
 
@@ -169,8 +178,9 @@ def _combobox_shell(
     ``options_children`` (value rows plus any pinned pseudo-options), the
     ``container_attributes`` that carry the widget's identity and behaviour flags,
     and any ``templates`` (inert ``<template>`` prototypes the JS clones for
-    dynamically-added rows/pills). The shell knows nothing about how individual
-    rows or pills look.
+    dynamically-added rows/pills). An optional ``leading`` element is placed
+    before the pills (e.g. the filter match-mode select). The shell knows nothing
+    about how individual rows or pills look.
     """
     search = Input(attributes=search_attributes)
 
@@ -191,10 +201,11 @@ def _combobox_shell(
         children=[*options_children, no_results],
     )
 
-    return Div(
-        attributes=container_attributes,
-        children=[pills, search, options_panel, *(templates or [])],
-    )
+    children: list[SafeText] = []
+    if leading is not None:
+        children.append(leading)
+    children += [pills, search, options_panel, *(templates or [])]
+    return Div(attributes=container_attributes, children=children)
 
 
 def SearchSelect(
@@ -397,6 +408,35 @@ def _filter_modifier_row(modifier_value: str, label: str) -> SafeText:
     )
 
 
+def _filter_match_select(match_modes: list[LabeledOption], active: str) -> SafeText:
+    """The include-set match-mode ``<select>`` (e.g. any/all/none).
+
+    Each option's value is a ``Modifier`` name (INCLUDES / INCLUDES_ALL /
+    EXCLUDES) that governs how the include (✓) pills match; the exclude (✗) pills
+    stay an orthogonal negative. ``readSearchSelect`` reads the chosen value into
+    the container's ``data-match`` and ``filter_bar.js`` folds it into the
+    criterion's ``modifier``. Distinct from the pinned (Any)/(None) pseudo-options
+    (presence: NOT_NULL / IS_NULL), which clear the value pills.
+    """
+    option_nodes: list[SafeText] = []
+    for modifier_value, label in match_modes:
+        attributes: list[HTMLAttribute] = [("value", modifier_value)]
+        if modifier_value == active:
+            attributes.append(("selected", ""))
+        option_nodes.append(
+            Component(tag_name="option", attributes=attributes, children=[label])
+        )
+    return Component(
+        tag_name="select",
+        attributes=[
+            ("data-search-select-match", ""),
+            ("aria-label", "Match mode"),
+            ("class", _FILTER_MATCH_SELECT_CLASS),
+        ],
+        children=option_nodes,
+    )
+
+
 def FilterSelect(
     *,
     field_name: str,
@@ -405,6 +445,8 @@ def FilterSelect(
     excluded: list[LabeledOption | SearchSelectOption] | None = None,
     modifier: str = "",
     modifier_options: list[LabeledOption] | None = None,
+    match: str = "",
+    match_modes: list[LabeledOption] | None = None,
     search_url: str = "",
     prefetch: int = 0,
     items_visible: int = 6,
@@ -421,6 +463,14 @@ def FilterSelect(
     value pills. State is read from the DOM into the filter JSON by
     ``readSearchSelect`` (filter mode) — nothing is submitted by ``name``.
 
+    When ``match_modes`` is given (e.g.
+    ``[("INCLUDES", "any"), ("INCLUDES_ALL", "all"), ("EXCLUDES", "none")]``) a
+    small ``<select>`` is rendered before the pills, letting the user choose how
+    the include (✓) set matches — Stash's modifier axis. ``match`` is the active
+    one (defaults to the first). It is orthogonal to ``modifier_options`` (which
+    handle presence) and to the exclude (✗) channel. ``INCLUDES_ALL`` is only
+    meaningful for many-to-many fields.
+
     ``included``/``excluded`` are resolved options (value + label) so pills show
     labels even when the value rows come from ``search_url``. ``options``
     pre-renders the value rows for the complete-set (no ``search_url``) case.
@@ -429,6 +479,8 @@ def FilterSelect(
     included = [_normalize_option(option) for option in (included or [])]
     excluded = [_normalize_option(option) for option in (excluded or [])]
     modifier_options = modifier_options or []
+    match_modes = match_modes or []
+    active_match = match or (match_modes[0][0] if match_modes else "")
 
     active_modifier_label = ""
     for modifier_value, label in modifier_options:
@@ -512,9 +564,13 @@ def FilterSelect(
     ]
     if modifier:
         container_attributes.append(("data-modifier", modifier))
+    if match_modes:
+        container_attributes.append(("data-match", active_match))
     if id:
         container_attributes.append(("id", id))
 
+    leading = _filter_match_select(match_modes, active_match) if match_modes else None
+
     return _combobox_shell(
         container_attributes=container_attributes,
         pills=pills,
@@ -523,6 +579,7 @@ def FilterSelect(
         always_visible=False,
         items_visible=items_visible,
         templates=templates,
+        leading=leading,
     )
 
 
diff --git a/common/criteria.py b/common/criteria.py
index b3bd7c2..4af3308 100644
--- a/common/criteria.py
+++ b/common/criteria.py
@@ -271,17 +271,26 @@ class _SetCriterion(_Criterion):
     """Shared base for set-membership criteria (``MultiCriterion`` /
     ``ChoiceCriterion``).
 
-    ``value`` is the include set and ``excludes`` the exclude set. The common
-    modifiers are implemented once here so the two subclasses cannot drift:
+    Two orthogonal channels, mirroring Stash's modifier model:
 
-    - ``INCLUDES`` — in ``value`` (when non-empty) AND not in ``excludes`` (when
-      non-empty). Empty lists contribute no constraint, so an exclude-only
-      criterion means "everything except ``excludes``".
-    - ``EQUALS`` — alias of ``INCLUDES``.
-    - ``IS_NULL`` / ``NOT_NULL`` — presence; the lists are ignored.
+    - ``value`` is the *include* set. The ``modifier`` governs how it matches:
 
-    Subclasses contribute their own modifiers (e.g. ``INCLUDES_ALL``) by
-    overriding ``_extra_q``.
+      - ``INCLUDES`` — in ``value`` (match *any*); ``EQUALS`` is an alias.
+      - ``INCLUDES_ALL`` — related to *all* of ``value`` (meaningful for
+        many-to-many fields, e.g. a purchase's games).
+      - ``EXCLUDES`` — in none of ``value`` (match *none*); ``NOT_EQUALS`` is an
+        alias.
+
+    - ``excludes`` is an *always-orthogonal* negative: it contributes
+      ``AND NOT IN (excludes)`` for every (non-presence) modifier, never
+      swapped into the include set. An exclude-only criterion therefore means
+      "everything except ``excludes``".
+
+    Empty lists contribute no constraint. ``IS_NULL`` / ``NOT_NULL`` test
+    presence and ignore both lists.
+
+    The logic lives entirely here so the two subclasses (which differ only in
+    their value type) cannot drift.
     """
 
     value: list = field(default_factory=list)
@@ -290,25 +299,37 @@ class _SetCriterion(_Criterion):
 
     def to_q(self, field_name: str) -> Q:
         modifier = self.modifier
-        if modifier in (Modifier.INCLUDES, Modifier.EQUALS):
-            q = Q()
-            if self.value:
-                q &= Q(**{f"{field_name}__in": self.value})
-            if self.excludes:
-                q &= ~Q(**{f"{field_name}__in": self.excludes})
-            return q
         if modifier == Modifier.IS_NULL:
             return Q(**{f"{field_name}__isnull": True})
         if modifier == Modifier.NOT_NULL:
             return Q(**{f"{field_name}__isnull": False})
-        extra = self._extra_q(field_name)
-        if extra is not None:
-            return extra
-        raise ValueError(f"Unsupported modifier {modifier} for {type(self).__name__}")
+        # The modifier governs only the include set; ``excludes`` is an orthogonal
+        # AND'd negative applied for every (non-presence) modifier.
+        q = self._value_q(field_name)
+        if self.excludes:
+            q &= ~Q(**{f"{field_name}__in": self.excludes})
+        return q
 
-    def _extra_q(self, field_name: str) -> Q | None:
-        """Hook for subclass-specific modifiers; ``None`` means unsupported."""
-        return None
+    def _value_q(self, field_name: str) -> Q:
+        """Build the Q for the include (``value``) set, per the modifier."""
+        modifier = self.modifier
+        if modifier in (Modifier.INCLUDES, Modifier.EQUALS):
+            return Q(**{f"{field_name}__in": self.value}) if self.value else Q()
+        if modifier in (Modifier.EXCLUDES, Modifier.NOT_EQUALS):
+            return ~Q(**{f"{field_name}__in": self.value}) if self.value else Q()
+        if modifier == Modifier.INCLUDES_ALL:
+            # Logical AND of equalities ("related to every value"). NOTE: for a
+            # *multi-valued* relation this only behaves as "has all" when each
+            # equality lands on its own join — i.e. applied via chained
+            # ``.filter()`` calls or a ``pk__in`` subquery, not a single
+            # ``.filter(Q(rel=a) & Q(rel=b))`` (which would require one related
+            # row to equal both). M2M callers (e.g. PurchaseFilter.games) build
+            # that subquery; see PurchaseFilter._games_to_q.
+            q = Q()
+            for value in self.value:
+                q &= Q(**{field_name: value})
+            return q
+        raise ValueError(f"Unsupported modifier {modifier} for {type(self).__name__}")
 
     @classmethod
     def from_json(cls, data: dict | None) -> Self | None:
@@ -317,51 +338,38 @@ class _SetCriterion(_Criterion):
             return None
         # Labels embedded as {id, label} dicts are display-only; strip to bare ids
         # so the querying layer stays clean and typed.
-        result.value = [item["id"] if isinstance(item, dict) else item for item in result.value]
-        result.excludes = [item["id"] if isinstance(item, dict) else item for item in result.excludes]
+        result.value = [
+            item["id"] if isinstance(item, dict) else item for item in result.value
+        ]
+        result.excludes = [
+            item["id"] if isinstance(item, dict) else item for item in result.excludes
+        ]
         return result
 
 
 @dataclass
 class MultiCriterion(_SetCriterion):
-    """Filter on a many-to-many or ForeignKey relationship by ID list."""
+    """Filter on a many-to-many or ForeignKey relationship by ID list.
+
+    All modifier logic (including ``INCLUDES_ALL`` and ``EXCLUDES``) lives in
+    ``_SetCriterion``; this subclass only refines the value type.
+    """
 
     value: list[int] = field(default_factory=list)
     excludes: list[int] = field(default_factory=list)
 
-    def _extra_q(self, field_name: str) -> Q | None:
-        if self.modifier == Modifier.EXCLUDES:
-            return ~Q(**{f"{field_name}__in": self.value})
-        if self.modifier == Modifier.INCLUDES_ALL:
-            q = Q()
-            for value in self.value:
-                q &= Q(**{field_name: value})
-            return q
-        return None
-
 
 @dataclass
 class ChoiceCriterion(_SetCriterion):
     """Filter on a choice/enum field with multi-select include/exclude.
 
-    Used by FilterSelect widgets for status, ownership_type, etc.
+    Used by FilterSelect widgets for status, ownership_type, etc. Shares all
+    modifier logic with ``MultiCriterion`` via ``_SetCriterion``.
     """
 
     value: list[str] = field(default_factory=list)
     excludes: list[str] = field(default_factory=list)
 
-    def _extra_q(self, field_name: str) -> Q | None:
-        if self.modifier == Modifier.EXCLUDES:
-            q = Q()
-            if self.value:
-                q &= ~Q(**{f"{field_name}__in": self.value})
-            if self.excludes:
-                q &= Q(**{f"{field_name}__in": self.excludes})
-            return q
-        if self.modifier == Modifier.NOT_EQUALS:
-            return ~Q(**{f"{field_name}__in": self.value})
-        return None
-
 
 # ── OperatorFilter base ────────────────────────────────────────────────────
 
diff --git a/games/filters.py b/games/filters.py
index 39df191..47bc539 100644
--- a/games/filters.py
+++ b/games/filters.py
@@ -331,7 +331,7 @@ class PurchaseFilter(OperatorFilter):
         if self.platform is not None:
             q &= self.platform.to_q("platform_id")
         if self.games is not None:
-            q &= self.games.to_q("games")
+            q &= self._games_to_q(self.games)
         if self.date_purchased is not None:
             q &= self.date_purchased.to_q("date_purchased")
         if self.date_refunded is not None:
@@ -385,6 +385,29 @@ class PurchaseFilter(OperatorFilter):
 
         return q
 
+    @staticmethod
+    def _games_to_q(criterion: ChoiceCriterion) -> Q:
+        """Build the Q for the many-to-many ``games`` field.
+
+        ``INCLUDES_ALL`` ("related to every selected game") cannot be a single
+        ``.filter(Q(games=a) & Q(games=b))`` — that collapses to one join and
+        would require a single link row to be both games. Instead chain a filter
+        per game so each gets its own join, then match by ``pk``. The orthogonal
+        ``excludes`` channel is applied as a negative, consistent with every
+        other modifier. All other modifiers delegate to the criterion.
+        """
+        if criterion.modifier == Modifier.INCLUDES_ALL and criterion.value:
+            from games.models import Purchase
+
+            subquery = Purchase.objects.all()
+            for game_id in criterion.value:
+                subquery = subquery.filter(games=game_id)
+            q = Q(pk__in=subquery.values("pk"))
+            if criterion.excludes:
+                q &= ~Q(games__in=criterion.excludes)
+            return q
+        return criterion.to_q("games")
+
 
 # ── Convenience helpers ────────────────────────────────────────────────────
 
diff --git a/games/static/js/filter_bar.js b/games/static/js/filter_bar.js
index 54e3a7f..1ceeb40 100644
--- a/games/static/js/filter_bar.js
+++ b/games/static/js/filter_bar.js
@@ -67,16 +67,21 @@
       var field = widget.getAttribute("data-name");
       var included = parseJSONAttr(widget, "data-included");
       var excluded = parseJSONAttr(widget, "data-excluded");
-      var modifier = widget.getAttribute("data-modifier");
-      if (modifier === "NOT_NULL" || modifier === "IS_NULL") {
-        filter[field] = { modifier: modifier };
+      // Two orthogonal axes: a presence modifier (NOT_NULL/IS_NULL) from the
+      // pinned (Any)/(None) pseudo-options clears the value set, while the
+      // match mode (INCLUDES/INCLUDES_ALL/EXCLUDES) governs how the include set
+      // matches. Fields without a match-mode select default to INCLUDES.
+      var presence = widget.getAttribute("data-modifier");
+      var match = widget.getAttribute("data-match") || "INCLUDES";
+      if (presence === "NOT_NULL" || presence === "IS_NULL") {
+        filter[field] = { modifier: presence };
       } else if (included.length > 0 || excluded.length > 0) {
         // All filter pills carry {id, label}; store them as-is so the filter
         // URL and saved presets are self-describing (Stash-style).
         filter[field] = {
           value: included.map(function (item) { return {id: item.id, label: item.label}; }),
           excludes: excluded.map(function (item) { return {id: item.id, label: item.label}; }),
-          modifier: modifier || "INCLUDES",
+          modifier: match,
         };
       }
     });
diff --git a/games/static/js/search_select.js b/games/static/js/search_select.js
index 50325f3..db0d16f 100644
--- a/games/static/js/search_select.js
+++ b/games/static/js/search_select.js
@@ -447,6 +447,11 @@
         container.setAttribute("data-excluded", JSON.stringify(excluded));
         if (modifier) container.setAttribute("data-modifier", modifier);
         else container.removeAttribute("data-modifier");
+        // The match-mode <select> (any/all/none) governs how the include set
+        // matches; its value is the criterion modifier. A native control, so its
+        // value is read directly — no pill bookkeeping.
+        var matchSelect = container.querySelector("[data-search-select-match]");
+        if (matchSelect) container.setAttribute("data-match", matchSelect.value);
         return;
       }
       var values = pills
diff --git a/tests/test_filter_bars.py b/tests/test_filter_bars.py
index 55e99f3..8af2ce4 100644
--- a/tests/test_filter_bars.py
+++ b/tests/test_filter_bars.py
@@ -92,16 +92,64 @@ class FilterBarRenderingTest(TestCase):
         self._assert_shell(html, "/presets/purchases/list", "/presets/purchases/save")
         self._assert_range_slider(html)
 
+    def test_purchase_filter_bar_games_has_match_modes(self):
+        """The many-to-many games field surfaces the any/all/none match select;
+        single-valued fields (platform) do not."""
+        html = str(
+            PurchaseFilterBar(
+                filter_json="", preset_list_url="/l", preset_save_url="/s"
+            )
+        )
+        self.assertIn("data-search-select-match", html)
+        self.assertIn('value="INCLUDES_ALL"', html)
+        # Platform is single-valued: no match select before its widget.
+        games_start = html.find('data-name="games"')
+        platform_start = html.find('data-name="platform"')
+        platform_section = html[platform_start:]
+        self.assertNotIn("data-search-select-match", platform_section)
+        self.assertGreater(games_start, 0)
+
+    def test_purchase_filter_bar_roundtrips_includes_all(self):
+        """A stored INCLUDES_ALL modifier pre-selects the match <option> and the
+        included game still renders as a pill."""
+        filter_json = json.dumps(
+            {
+                "games": {
+                    "value": [{"id": "5", "label": "Hollow Knight"}],
+                    "modifier": "INCLUDES_ALL",
+                }
+            }
+        )
+        html = str(
+            PurchaseFilterBar(
+                filter_json=filter_json, preset_list_url="/l", preset_save_url="/s"
+            )
+        )
+        self.assertIn('data-match="INCLUDES_ALL"', html)
+        self.assertIn('value="INCLUDES_ALL" selected=""', html)
+        self.assertIn("Hollow Knight", html)
+        self.assertIn('data-search-select-type="include"', html)
+        self.assertNoEscapedTags(html)
+
     def test_game_filter_bar_roundtrips_selected_status(self):
         """A status in filter_json renders as an include pill in the widget."""
-        filter_json = json.dumps({"status": {"value": [{"id": "f", "label": "Finished"}], "modifier": "INCLUDES"}})
+        filter_json = json.dumps(
+            {
+                "status": {
+                    "value": [{"id": "f", "label": "Finished"}],
+                    "modifier": "INCLUDES",
+                }
+            }
+        )
         html = str(
             FilterBar(
                 filter_json=filter_json, preset_list_url="/l", preset_save_url="/s"
             )
         )
         self.assertIn('data-search-select-mode="filter"', html)
-        self.assertIn('data-search-select-type="include"', html)  # rendered as an include pill
+        self.assertIn(
+            'data-search-select-type="include"', html
+        )  # rendered as an include pill
         self.assertIn('data-value="f"', html)  # selected status reflected in widget
         self.assertIn("Finished", html)  # ...with its label
         self.assertNoEscapedTags(html)
diff --git a/tests/test_filters.py b/tests/test_filters.py
index f1af683..43d755c 100644
--- a/tests/test_filters.py
+++ b/tests/test_filters.py
@@ -94,6 +94,18 @@ class TestChoiceCriterion:
         q = c.to_q("status")
         assert q == Q()
 
+    def test_excludes_modifier_keeps_excludes_orthogonal(self):
+        """Harmonized (Stash model): under EXCLUDES the ``excludes`` channel stays
+        an orthogonal AND'd negative — it is *not* swapped into a positive
+        include (the old divergent ChoiceCriterion behaviour)."""
+        c = ChoiceCriterion(value=["f"], excludes=["a"], modifier=Modifier.EXCLUDES)
+        assert c.to_q("status") == ~Q(status__in=["f"]) & ~Q(status__in=["a"])
+
+    def test_includes_all(self):
+        """INCLUDES_ALL ANDs an equality per value (shared with MultiCriterion)."""
+        c = ChoiceCriterion(value=["f", "p"], modifier=Modifier.INCLUDES_ALL)
+        assert c.to_q("status") == Q(status="f") & Q(status="p")
+
     def test_not_equals(self):
         c = ChoiceCriterion(value=["f"], modifier=Modifier.NOT_EQUALS)
         assert c.to_q("status") == ~Q(status__in=["f"])
@@ -117,6 +129,18 @@ class TestMultiCriterion:
         c = MultiCriterion(value=[1], excludes=[2], modifier=Modifier.INCLUDES)
         assert c.to_q("game_id") == Q(game_id__in=[1]) & ~Q(game_id__in=[2])
 
+    def test_excludes_modifier_applies_excludes_channel(self):
+        """Harmonized (Stash model): EXCLUDES negates ``value`` AND still applies
+        the orthogonal ``excludes`` channel. Previously MultiCriterion.EXCLUDES
+        dropped the excludes list entirely."""
+        c = MultiCriterion(value=[1], excludes=[2], modifier=Modifier.EXCLUDES)
+        assert c.to_q("game_id") == ~Q(game_id__in=[1]) & ~Q(game_id__in=[2])
+
+    def test_includes_all(self):
+        """INCLUDES_ALL requires the row to relate to every value (M2M)."""
+        c = MultiCriterion(value=[1, 2], modifier=Modifier.INCLUDES_ALL)
+        assert c.to_q("games") == Q(games=1) & Q(games=2)
+
     def test_is_null(self):
         c = MultiCriterion(value=[], modifier=Modifier.IS_NULL)
         assert c.to_q("device_id") == Q(device_id__isnull=True)
@@ -124,7 +148,10 @@ class TestMultiCriterion:
     def test_from_json_strips_embedded_labels(self):
         """from_json normalises {id, label} dicts to bare ids."""
         c = MultiCriterion.from_json(
-            {"value": [{"id": 797, "label": "Hollow Knight"}], "excludes": [{"id": 11, "label": "Steam Deck"}]}
+            {
+                "value": [{"id": 797, "label": "Hollow Knight"}],
+                "excludes": [{"id": 11, "label": "Steam Deck"}],
+            }
         )
         assert c.value == [797]
         assert c.excludes == [11]
@@ -216,6 +243,96 @@ class TestChoiceCriterionAgainstDB:
         assert self._count(c) == 0
 
 
+class TestPurchaseGamesIncludesAllAgainstDB:
+    """INCLUDES_ALL on the many-to-many ``Purchase.games`` should match only
+    purchases linked to *all* of the given games — Stash's ``includes all``."""
+
+    def _seed(self):
+        import datetime
+
+        from games.models import Game, Platform, Purchase
+
+        platform, _ = Platform.objects.get_or_create(name="Test", icon="test")
+        a, _ = Game.objects.get_or_create(name="A", defaults={"platform": platform})
+        b, _ = Game.objects.get_or_create(name="B", defaults={"platform": platform})
+        c, _ = Game.objects.get_or_create(name="C", defaults={"platform": platform})
+
+        def make(linked):
+            purchase = Purchase.objects.create(
+                platform=platform, date_purchased=datetime.date(2024, 1, 1)
+            )
+            purchase.games.set(linked)
+            return purchase
+
+        return {
+            "a": a,
+            "b": b,
+            "both": make([a, b]),
+            "only_a": make([a]),
+            "all_three": make([a, b, c]),
+        }
+
+    @pytest.mark.django_db
+    def test_includes_all_matches_only_supersets(self):
+        from games.filters import PurchaseFilter
+        from games.models import Purchase
+
+        seeded = self._seed()
+        pf = PurchaseFilter.from_json(
+            {
+                "games": {
+                    "value": [seeded["a"].id, seeded["b"].id],
+                    "modifier": "INCLUDES_ALL",
+                }
+            }
+        )
+        result = set(Purchase.objects.filter(pf.to_q()))
+        assert result == {seeded["both"], seeded["all_three"]}
+
+    @pytest.mark.django_db
+    def test_includes_any_is_broader(self):
+        """Contrast: plain INCLUDES (any) also matches the A-only purchase."""
+        from games.filters import PurchaseFilter
+        from games.models import Purchase
+
+        seeded = self._seed()
+        pf = PurchaseFilter.from_json(
+            {
+                "games": {
+                    "value": [seeded["a"].id, seeded["b"].id],
+                    "modifier": "INCLUDES",
+                }
+            }
+        )
+        result = set(Purchase.objects.filter(pf.to_q()))
+        assert result == {seeded["both"], seeded["only_a"], seeded["all_three"]}
+
+    @pytest.mark.django_db
+    def test_includes_all_strips_embedded_labels(self):
+        """Stash-style {id, label} value items are normalised to bare ids."""
+        from common.criteria import Modifier
+        from games.filters import PurchaseFilter
+        from games.models import Purchase
+
+        seeded = self._seed()
+        pf = PurchaseFilter.from_json(
+            {
+                "games": {
+                    "value": [
+                        {"id": seeded["a"].id, "label": "A"},
+                        {"id": seeded["b"].id, "label": "B"},
+                    ],
+                    "modifier": "INCLUDES_ALL",
+                }
+            }
+        )
+        assert pf.games is not None
+        assert pf.games.modifier == Modifier.INCLUDES_ALL
+        assert pf.games.value == [seeded["a"].id, seeded["b"].id]
+        result = set(Purchase.objects.filter(pf.to_q()))
+        assert result == {seeded["both"], seeded["all_three"]}
+
+
 class TestGameFilterFromJson:
     def test_status_choice_criterion(self):
         gf = GameFilter.from_json(
@@ -293,7 +410,12 @@ class TestFilterBarRendering:
         html = str(
             FilterBar(
                 filter_json=json.dumps(
-                    {"status": {"value": [{"id": "f", "label": "Finished"}], "modifier": "INCLUDES"}}
+                    {
+                        "status": {
+                            "value": [{"id": "f", "label": "Finished"}],
+                            "modifier": "INCLUDES",
+                        }
+                    }
                 ),
             )
         )
diff --git a/tests/test_search_select.py b/tests/test_search_select.py
index 9009f89..9b8dc76 100644
--- a/tests/test_search_select.py
+++ b/tests/test_search_select.py
@@ -208,7 +208,9 @@ class FilterSelectComponentTest(unittest.TestCase):
         panel = html.split("data-search-select-template")[0]
         self.assertNotIn('data-search-select-option=""', panel)
         self.assertIn('data-search-select-template="row"', html)
-        self.assertIn('data-search-select-modifier-option="NOT_NULL"', html)  # still pinned
+        self.assertIn(
+            'data-search-select-modifier-option="NOT_NULL"', html
+        )  # still pinned
         self.assertIn('data-prefetch="20"', html)
 
     def test_search_url_pills_use_resolved_labels(self):
@@ -221,6 +223,29 @@ class FilterSelectComponentTest(unittest.TestCase):
         self.assertIn(">Obscure Game</span>", html)
         self.assertIn('data-value="4172"', html)
 
+    MATCH_MODES = [("INCLUDES", "any"), ("INCLUDES_ALL", "all"), ("EXCLUDES", "none")]
+
+    def test_match_modes_render_native_select(self):
+        html = FilterSelect(field_name="games", match_modes=self.MATCH_MODES)
+        # A native <select> carries the include-set match mode; options are labels.
+        self.assertIn("data-search-select-match", html)
+        self.assertIn('value="INCLUDES_ALL"', html)
+        self.assertIn(">all</option>", html)
+        # The container exposes the active mode (defaults to the first) for the JS.
+        self.assertIn('data-match="INCLUDES"', html)
+
+    def test_active_match_marks_selected_option(self):
+        html = FilterSelect(
+            field_name="games", match="INCLUDES_ALL", match_modes=self.MATCH_MODES
+        )
+        self.assertIn('data-match="INCLUDES_ALL"', html)
+        self.assertIn('value="INCLUDES_ALL" selected=""', html)
+
+    def test_no_match_modes_omits_select(self):
+        html = FilterSelect(field_name="status", options=[("f", "Finished")])
+        self.assertNotIn("data-search-select-match", html)
+        self.assertNotIn("data-match=", html)
+
 
 class SearchLabelTest(django.test.TestCase):
     @classmethod