diff --git a/cartridges/collections.py b/cartridges/collections.py
index b5411ee..8ad9258 100644
--- a/cartridges/collections.py
+++ b/cartridges/collections.py
@@ -21,6 +21,11 @@ class Collection(GObject.Object):
 
     icon_name = GObject.Property(type=str)
 
+    @GObject.Property(type=bool, default=True)
+    def in_model(self) -> bool:
+        """Whether `self` has been added to the model."""
+        return self in model
+
     def __init__(self, **kwargs: Any):
         super().__init__(**kwargs)
 
@@ -54,6 +59,9 @@ def load():
     model.splice(0, 0, tuple(_get_collections()))
     save()
 
+    for collection in model:
+        collection.notify("in-model")
+
 
 def save():
     """Save collections to GSettings."""
diff --git a/cartridges/ui/collection-details.blp b/cartridges/ui/collection-details.blp
new file mode 100644
index 0000000..c569228
--- /dev/null
+++ b/cartridges/ui/collection-details.blp
@@ -0,0 +1,58 @@
+using Gtk 4.0;
+using Adw 1;
+
+template $CollectionDetails: Adw.Dialog {
+  title: _("New Collection");
+  content-width: 360;
+  default-widget: apply_button;
+  focus-widget: name_entry;
+
+  child: Adw.ToolbarView {
+    [top]
+    Adw.HeaderBar {
+      show-start-title-buttons: false;
+      show-end-title-buttons: false;
+
+      [start]
+      Button {
+        action-name: "window.close";
+        icon-name: "cancel-symbolic";
+        tooltip-text: _("Cancel");
+      }
+
+      [end]
+      Button apply_button {
+        action-name: "details.apply";
+        icon-name: "apply-symbolic";
+        tooltip-text: _("Add");
+
+        styles [
+          "suggested-action",
+        ]
+      }
+    }
+
+    content: Adw.PreferencesPage {
+      Adw.PreferencesGroup {
+        Adw.EntryRow name_entry {
+          title: _("Name");
+          activates-default: true;
+        }
+      }
+
+      Adw.PreferencesGroup {
+        FlowBox icons_box {
+          min-children-per-line: 7;
+
+          styles [
+            "navigation-sidebar",
+          ]
+        }
+
+        styles [
+          "card",
+        ]
+      }
+    };
+  };
+}
diff --git a/cartridges/ui/collection_details.py b/cartridges/ui/collection_details.py
new file mode 100644
index 0000000..ef9c721
--- /dev/null
+++ b/cartridges/ui/collection_details.py
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+# SPDX-FileCopyrightText: Copyright 2025 Jamie Gravendeel
+
+from typing import Any, cast
+
+from gi.repository import Adw, Gio, GObject, Gtk
+
+from cartridges import collections
+from cartridges.collections import Collection
+from cartridges.config import PREFIX
+
+ICONS = (
+    "collection",
+    "star",
+    "heart",
+    "music",
+    "people",
+    "skull",
+    "private",
+    "globe",
+    "map",
+    "city",
+    "car",
+    "horse",
+    "sprout",
+    "step-over",
+    "gamepad",
+    "ball",
+    "puzzle",
+    "flashlight",
+    "knife",
+    "gun",
+    "fist",
+)
+
+
+@Gtk.Template.from_resource(f"{PREFIX}/collection-details.ui")
+class CollectionDetails(Adw.Dialog):
+    """The details of a category."""
+
+    __gtype_name__ = __qualname__
+
+    name_entry: Adw.EntryRow = Gtk.Template.Child()
+    icons_box: Gtk.FlowBox = Gtk.Template.Child()
+
+    collection = GObject.Property(type=Collection)
+
+    def __init__(self, **kwargs: Any):
+        super().__init__(**kwargs)
+
+        self.insert_action_group("details", group := Gio.SimpleActionGroup())
+
+        group.add_action(apply := Gio.SimpleAction.new("apply"))
+        apply.connect("activate", lambda *_: self._apply())
+        self.name_entry.bind_property(
+            "text",
+            apply,
+            "enabled",
+            GObject.BindingFlags.SYNC_CREATE,
+            transform_to=lambda _, text: bool(text),
+        )
+
+        icons = Gtk.StringList.new(tuple(f"{icon}-symbolic" for icon in ICONS))
+        self.icons_box.bind_model(
+            icons,
+            lambda string: Gtk.FlowBoxChild(
+                name="collection-icon-child",
+                child=Gtk.Image.new_from_icon_name(string.props.string),
+                halign=Gtk.Align.CENTER,
+            ),
+        )
+        self.icons_box.select_child(
+            cast(
+                Gtk.FlowBoxChild,
+                self.icons_box.get_child_at_index(ICONS.index(self.collection.icon)),
+            )
+        )
+
+    def _apply(self):
+        self.collection.name = self.name_entry.props.text
+        self.collection.icon = ICONS[
+            self.icons_box.get_selected_children()[0].get_index()
+        ]
+
+        if not self.collection.in_model:
+            collections.model.append(self.collection)
+            self.collection.notify("in-model")
+
+        collections.save()
+        self.close()
diff --git a/cartridges/ui/collections.py b/cartridges/ui/collections.py
index e01eeec..0f5d103 100644
--- a/cartridges/ui/collections.py
+++ b/cartridges/ui/collections.py
@@ -5,6 +5,7 @@ from typing import Any, override
 
 from gi.repository import Adw, GObject, Gtk
 
+from cartridges import collections
 from cartridges.collections import Collection
 from cartridges.games import Game
 
@@ -51,3 +52,17 @@ class CollectionSidebarItem(Adw.SidebarItem):  # pyright: ignore[reportAttribute
         super().__init__(**kwargs)
 
         self.bind_property("title", self, "tooltip", GObject.BindingFlags.SYNC_CREATE)
+
+
+sorter = Gtk.StringSorter.new(Gtk.PropertyExpression.new(Collection, None, "name"))
+model = Gtk.SortListModel.new(
+    Gtk.FilterListModel(
+        model=collections.model,
+        filter=Gtk.BoolFilter(
+            expression=Gtk.PropertyExpression.new(Collection, None, "removed"),
+            invert=True,
+        ),
+        watch_items=True,  # pyright: ignore[reportCallIssue]
+    ),
+    sorter,
+)
diff --git a/cartridges/ui/meson.build b/cartridges/ui/meson.build
index e430786..e92caf3 100644
--- a/cartridges/ui/meson.build
+++ b/cartridges/ui/meson.build
@@ -1,6 +1,7 @@
 python.install_sources(
     files(
         '__init__.py',
+        'collection_details.py',
         'collections.py',
         'cover.py',
         'game_details.py',
@@ -13,6 +14,7 @@ python.install_sources(
 
 blueprints = custom_target(
     input: files(
+        'collection-details.blp',
         'cover.blp',
         'game-details.blp',
         'game-item.blp',
diff --git a/cartridges/ui/style.css b/cartridges/ui/style.css
index 27cc367..e57c28b 100644
--- a/cartridges/ui/style.css
+++ b/cartridges/ui/style.css
@@ -63,6 +63,10 @@
   filter: saturate(300%) opacity(50%);
 }
 
+#collection-icon-child {
+  border-radius: 9999px;
+}
+
 @media (prefers-color-scheme: dark) {
   #details list {
     background: rgb(from white r g b / 10%);
diff --git a/cartridges/ui/ui.gresource.xml.in b/cartridges/ui/ui.gresource.xml.in
index 0bf75ae..fffc6a6 100644
--- a/cartridges/ui/ui.gresource.xml.in
+++ b/cartridges/ui/ui.gresource.xml.in
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <gresources>
   <gresource prefix="@PREFIX@">
+    <file>collection-details.ui</file>
     <file>cover.ui</file>
     <file>game-details.ui</file>
     <file>game-item.ui</file>
diff --git a/cartridges/ui/window.blp b/cartridges/ui/window.blp
index 2ee440e..3b60d3f 100644
--- a/cartridges/ui/window.blp
+++ b/cartridges/ui/window.blp
@@ -78,6 +78,8 @@ template $Window: Adw.ApplicationWindow {
 
             content: Adw.Sidebar sidebar {
               activated => $_navigate();
+              setup-menu => $_setup_sidebar_menu();
+              notify::selected => $_update_selection();
 
               Adw.SidebarSection {
                 Adw.SidebarItem {
@@ -89,6 +91,13 @@ template $Window: Adw.ApplicationWindow {
               Adw.SidebarSection collections {
                 title: _("Collections");
               }
+
+              Adw.SidebarSection {
+                Adw.SidebarItem new_collection_item {
+                  icon-name: "list-add-symbolic";
+                  title: _("New Collection");
+                }
+              }
             };
           };
         };
diff --git a/cartridges/ui/window.py b/cartridges/ui/window.py
index f871477..a37abae 100644
--- a/cartridges/ui/window.py
+++ b/cartridges/ui/window.py
@@ -10,11 +10,13 @@ from typing import Any, TypeVar, cast
 
 from gi.repository import Adw, Gio, GLib, GObject, Gtk
 
-from cartridges import STATE_SETTINGS, collections, games
+from cartridges import STATE_SETTINGS, games
 from cartridges.collections import Collection
 from cartridges.config import PREFIX, PROFILE
 from cartridges.games import Game
+from cartridges.ui import collections
 
+from .collection_details import CollectionDetails
 from .collections import (
     CollectionFilter,  # noqa: F401
     CollectionSidebarItem,
@@ -47,6 +49,7 @@ class Window(Adw.ApplicationWindow):
 
     split_view: Adw.OverlaySplitView = Gtk.Template.Child()
     collections: Adw.SidebarSection = Gtk.Template.Child()  # pyright: ignore[reportAttributeAccessIssue]
+    new_collection_item: Adw.SidebarItem = Gtk.Template.Child()  # pyright: ignore[reportAttributeAccessIssue]
     navigation_view: Adw.NavigationView = Gtk.Template.Child()
     header_bar: Adw.HeaderBar = Gtk.Template.Child()
     title_box: Gtk.CenterBox = Gtk.Template.Child()
@@ -64,6 +67,8 @@ class Window(Adw.ApplicationWindow):
 
     settings = GObject.Property(type=Gtk.Settings)
 
+    _selected_sidebar_item = 0
+
     @GObject.Property(type=Gio.ListStore)
     def games(self) -> Gio.ListStore:
         """Model of the user's games."""
@@ -128,9 +133,24 @@ class Window(Adw.ApplicationWindow):
     @Gtk.Template.Callback()
     def _navigate(self, sidebar: Adw.Sidebar, index: int):  # pyright: ignore[reportAttributeAccessIssue]
         item = sidebar.get_item(index)
-        self.collection = (
-            item.collection if isinstance(item, CollectionSidebarItem) else None
-        )
+
+        match item:
+            case self.new_collection_item:
+                self._add_collection()
+                sidebar.props.selected = self._selected_sidebar_item
+            case CollectionSidebarItem():
+                self.collection = item.collection
+            case _:
+                self.collection = None
+
+        if item is not self.new_collection_item:
+            self._selected_sidebar_item = index
+
+    @Gtk.Template.Callback()
+    def _update_selection(self, sidebar: Adw.Sidebar, *_args):  # pyright: ignore[reportAttributeAccessIssue]
+        if sidebar.props.selected_item is self.new_collection_item:
+            sidebar.props.selected = self._selected_sidebar_item
+        self._selected_sidebar_item = sidebar.props.selected
 
     @Gtk.Template.Callback()
     def _setup_gamepad_monitor(self, *_args):
@@ -186,6 +206,10 @@ class Window(Adw.ApplicationWindow):
 
         self.details.edit()
 
+    def _add_collection(self):
+        details = CollectionDetails(collection=Collection())
+        details.present(self)
+
     def _undo(self, toast: Adw.Toast | None = None):
         if toast:
             self._history.pop(toast)()
diff --git a/data/icons/apply-symbolic.svg b/data/icons/apply-symbolic.svg
new file mode 100644
index 0000000..aeee44d
--- /dev/null
+++ b/data/icons/apply-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M13.754 4.668c.176-.2.262-.461.246-.723a1 1 0 0 0-.34-.687 1 1 0 0 0-.726-.246 1 1 0 0 0-.688.34L5.95 10.547 3.707 8.3A1 1 0 0 0 2 9.01a1 1 0 0 0 .293.708l3 3c.195.195.465.3.742.293.278-.012.535-.133.719-.344zm0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/ball-symbolic.svg b/data/icons/ball-symbolic.svg
new file mode 100644
index 0000000..61246eb
--- /dev/null
+++ b/data/icons/ball-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M8 0C3.594 0 0 3.594 0 8s3.594 8 8 8 8-3.594 8-8-3.594-8-8-8m.469 2.02a5.98 5.98 0 0 1 5.511 5.52q-3.109.234-4.718 1.94c-1.055 1.114-1.586 2.649-1.723 4.5A5.98 5.98 0 0 1 2.02 8.47c2.06-.125 3.626-.656 4.708-1.739 1.085-1.085 1.617-2.652 1.742-4.71m-1.004.007c-.121 1.864-.598 3.149-1.445 3.996-.844.844-2.13 1.32-3.997 1.446a5.98 5.98 0 0 1 5.442-5.442m6.508 6.516a5.98 5.98 0 0 1-5.434 5.434c.137-1.653.61-2.922 1.45-3.809.855-.91 2.136-1.477 3.984-1.625m0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/cancel-symbolic.svg b/data/icons/cancel-symbolic.svg
new file mode 100644
index 0000000..7b97b6f
--- /dev/null
+++ b/data/icons/cancel-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M3.02 2a1 1 0 0 0-.707 1.707L6.605 8l-4.292 4.293a1 1 0 1 0 1.414 1.414L8.02 9.414l4.293 4.293a1 1 0 1 0 1.414-1.414L9.434 8l4.293-4.293a1 1 0 1 0-1.415-1.414L8.02 6.586 3.727 2.293A1 1 0 0 0 3.02 2m0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/car-symbolic.svg b/data/icons/car-symbolic.svg
new file mode 100644
index 0000000..3e1a331
--- /dev/null
+++ b/data/icons/car-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:gpa="https://www.gtk.org/grappa" gpa:keywords="car vehicle ice combustion engine internal" gpa:state="0" gpa:version="1" width="16" height="16"><path gpa:fill="none" gpa:stroke="foreground" gpa:stroke-width="0.25 1 1.5" fill="none" stroke="url(&quot;#gpa:foreground&quot;) rgb(0,0,0)" stroke-dashoffset="3.2" stroke-linecap="round" stroke-linejoin="round" d="M6 13.496h4" class="transparent-fill foreground-stroke"/><path gpa:fill="none" gpa:stroke="foreground" gpa:stroke-width="0.5 2 3" fill="none" stroke="url(&quot;#gpa:foreground&quot;) rgb(0,0,0)" stroke-dashoffset="3.2" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 13.5a1.5 1.5 0 1 1-3 0 1.5 1.5 0 0 1 3 0m7 0a1.5 1.5 0 1 1-3 0 1.5 1.5 0 0 1 3 0M1 9h11.486A2.514 2.514 0 0 1 15 11.514 2.256 2.256 0 0 1 13 14M3 14a2 2 0 0 1-2-2V7a2 2 0 0 1 2-2h5c1.226 0 2.346.693 2.894 1.789L12 9" class="transparent-fill foreground-stroke"/></svg>
\ No newline at end of file
diff --git a/data/icons/city-symbolic.svg b/data/icons/city-symbolic.svg
new file mode 100644
index 0000000..c241bef
--- /dev/null
+++ b/data/icons/city-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M6 0v4H5v2H4v9H3V6H0v10h16v-1h-1v-4h-1V3l-3 3v5h-1v4H9V6H8V4H7V0zm6.5 6a.499.499 0 1 1 0 1 .499.499 0 1 1 0-1M1 7h1v1H1zm4 0h3v1H5zm7.5 1a.499.499 0 1 1 0 1 .499.499 0 1 1 0-1M1 9h1v1H1zm4 0h3v1H5zm7.5 1.008a.499.499 0 1 1-.5.5c0-.278.223-.5.5-.5M1 11h1v1H1zm4 0h3v1H5zm6 1h3v1h-3zM1 13h1v1H1zm4 0h3v1H5zm0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/fist-symbolic.svg b/data/icons/fist-symbolic.svg
new file mode 100644
index 0000000..f083931
--- /dev/null
+++ b/data/icons/fist-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M1.977 7c-.551 0-1 .45-1 1v1.617c0 1.098.32 2.168.921 3.086l.114.172A4.72 4.72 0 0 0 5.949 15H12c1.645 0 3-1.355 3-3V9.914c-.004-.008 0-.008 0-.016 0-.023-.012-.043-.012-.066v-.016c0-.023-.011-.043-.015-.066-.012-.027-.016-.055-.024-.082l-.031-.074s0-.012-.008-.016q-.019-.029-.031-.062s0-.008-.012-.012q-.016-.03-.039-.059-.023-.036-.047-.066-.02-.026-.043-.05c0-.009-.011-.009-.015-.017l-.008-.007q-.026-.029-.05-.051l-.013-.008a.3.3 0 0 0-.054-.043s-.008-.012-.012-.012l-.059-.039-.011-.011-.063-.032-.074-.035c-.012 0-.012-.008-.016-.008q-.03-.017-.066-.027h-.012a.4.4 0 0 0-.066-.016c-.024-.011-.047-.011-.067-.015h-.047c-.023 0-.046-.008-.066-.008H8.703a2 2 0 0 1-1.73.996h-2v1c-.551 0-1-.45-1-1v-1h3a1 1 0 0 0 .304-.047c.028-.008.051-.02.078-.027.29-.121.508-.371.586-.676.012-.027.012-.055.02-.082q.012-.082.012-.168a1 1 0 0 0-1-.996zM8 2c-.555 0-1 .445-1 1v3h2V3a1 1 0 0 0-1-1m2.973-.004a1 1 0 0 0-1 1V7a1 1 0 1 0 2 0V2.996c0-.55-.45-1-1-1m3 1.5a1 1 0 0 0-1 1V7a1 1 0 1 0 2 0V4.496c0-.55-.45-1-1-1m-9-.496c-.551 0-1 .45-1 1v2h2V4a1 1 0 0 0-1-1m0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/flashlight-symbolic.svg b/data/icons/flashlight-symbolic.svg
new file mode 100644
index 0000000..090c0d8
--- /dev/null
+++ b/data/icons/flashlight-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M4.945 0C4 0 4 1 4 1h8s0-1-1-1zM4 2a4 4 0 0 0 2 3.465V15s-.023 1 2 1c1.922 0 2-1 2-1l.004-9.54A4 4 0 0 0 12 2zm4 4.5c.555 0 1 .445 1 1v1c0 .555-.445 1-1 1s-1-.445-1-1v-1c0-.555.445-1 1-1m0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/gamepad-symbolic.svg b/data/icons/gamepad-symbolic.svg
new file mode 100644
index 0000000..211231e
--- /dev/null
+++ b/data/icons/gamepad-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns:gpa="https://www.gtk.org/grappa" gpa:keywords="input-gaming applications-games controller gamepad" gpa:state="0" gpa:version="1" width="16" height="16"><path fill="none" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M1 5.51V11a3 3 0 0 0 3 3c.552 0 1-.336 1-1a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2c0 .717.53 1 1 1a3 3 0 0 0 3-3V5.51A4.51 4.51 0 0 0 10.49 1H5.51A4.51 4.51 0 0 0 1 5.51M12.025 6h.024M10 4h.025M4 6h4M6 4v4" class="foreground-stroke transparent-fill"/></svg>
\ No newline at end of file
diff --git a/data/icons/globe-symbolic.svg b/data/icons/globe-symbolic.svg
new file mode 100644
index 0000000..5021902
--- /dev/null
+++ b/data/icons/globe-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M7.52-.004c-4.13 0-7.5 3.371-7.5 7.5s3.37 7.5 7.5 7.5c4.128 0 7.5-3.371 7.5-7.5s-3.372-7.5-7.5-7.5m0 2c.253 0 .503.024.75.055.19.261.382.594.55 1.027.106.277.203.586.29.918H5.93q.13-.5.289-.918c.168-.433.36-.765.547-1.027.25-.031.496-.055.754-.055m-2.09.406c-.047.11-.102.203-.145.317-.148.386-.27.82-.379 1.277h-1.62A5.5 5.5 0 0 1 5.43 2.402m4.175 0a5.5 5.5 0 0 1 2.145 1.594h-1.617a10 10 0 0 0-.38-1.277c-.042-.114-.097-.207-.148-.317M2.621 4.996h2.086c-.098.629-.148 1.3-.168 2H2.055a5.6 5.6 0 0 1 .566-2m3.098 0h3.597c.106.617.16 1.293.184 2H5.54c.022-.707.077-1.383.179-2m4.613 0h2.082c.313.61.504 1.285.566 2H10.5c-.02-.7-.07-1.371-.168-2m-8.277 3h2.484c.02.7.07 1.375.168 2H2.621a5.6 5.6 0 0 1-.566-2m3.484 0H9.5a15 15 0 0 1-.184 2H5.72a16 16 0 0 1-.18-2m4.961 0h2.48a5.4 5.4 0 0 1-.566 2h-2.082c.098-.625.148-1.3.168-2m-7.215 3h1.621c.11.457.23.89.38 1.274.042.117.097.21.144.32a5.5 5.5 0 0 1-2.145-1.594m2.645 0h3.18q-.13.5-.29.918a4.4 4.4 0 0 1-.55 1.027 6 6 0 0 1-.75.055c-.254 0-.504-.023-.75-.055a4.4 4.4 0 0 1-.551-1.027 9 9 0 0 1-.29-.918m4.203 0h1.617a5.5 5.5 0 0 1-2.145 1.594c.051-.11.106-.203.149-.32.148-.383.27-.817.379-1.274m0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/gun-symbolic.svg b/data/icons/gun-symbolic.svg
new file mode 100644
index 0000000..459dbe3
--- /dev/null
+++ b/data/icons/gun-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M5 2.988V4.98a1 1 0 0 0-1-.992H1v1h2c.55 0 1 .45 1 1v.395a5.27 5.27 0 0 0-2.543 2.18l-.75 1.25A4.9 4.9 0 0 0 0 12.359v.63c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-3c0-.552.45-1 1-1 .195.98.96 1.792 2 2v-2h3v-3h5v-3h-1l-1 1h-3v-1zm2 1h3v1H7zm0 2h3v1H7zm0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/heart-symbolic.svg b/data/icons/heart-symbolic.svg
new file mode 100644
index 0000000..4c3911a
--- /dev/null
+++ b/data/icons/heart-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:gpa="https://www.gtk.org/grappa" gpa:keywords="heart emote-love" gpa:state="0" gpa:version="1" width="16" height="16"><path gpa:fill="none" gpa:states="0" gpa:stroke="foreground" gpa:stroke-width="0.5 2 3" fill="none" stroke="url(&quot;#gpa:foreground&quot;) rgb(0,0,0)" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 5.757A3.763 3.763 0 0 0 11.23 2C9.86 2 8.66 2.73 8 3.822A3.77 3.77 0 0 0 4.77 2 3.763 3.763 0 0 0 1 5.757c0 1.038.43 2.03 1.19 2.738h-.001l5.725 5.496 5.898-5.496h-.002c.76-.708 1.19-1.7 1.19-2.738" class="transparent-fill foreground-stroke"/></svg>
\ No newline at end of file
diff --git a/data/icons/horse-symbolic.svg b/data/icons/horse-symbolic.svg
new file mode 100644
index 0000000..c688662
--- /dev/null
+++ b/data/icons/horse-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><g fill="#222"><path d="M4.523 5.79C3.95 8.43 5.32 11 9 11l-.45-.105 4 2c.434.214.962.093 1.25-.293l1.5-2c.235-.317.266-.743.075-1.086l-5-9a1 1 0 0 0-1.43-.348l-1.5 1L8.008 1 7.156.992a5.724 5.724 0 0 0-5.726 4.93L.164 14.859A1.006 1.006 0 0 0 1.156 16H8c.55 0 1-.45 1-1v-2c0-.55-.45-1-1-1s-1 .45-1 1v2l1-1H1.156l.989 1.14L3.41 6.204a3.72 3.72 0 0 1 3.73-3.21L7.993 3c.2 0 .395-.059.563-.168l1.5-1-1.43-.348 5 9 .074-1.086-1.5 2 1.246-.293-4-2A1 1 0 0 0 9 9c-1.285 0-1.898-.371-2.242-.828-.34-.457-.457-1.14-.281-1.961a.996.996 0 0 0-.766-1.188.996.996 0 0 0-1.188.766m0 0"/><path d="M10 6c0 .55-.45 1-1 1s-1-.45-1-1 .45-1 1-1 1 .45 1 1m0 0"/></g></svg>
\ No newline at end of file
diff --git a/data/icons/icons.gresource.xml.in b/data/icons/icons.gresource.xml.in
index 872fbbc..ac3aa52 100644
--- a/data/icons/icons.gresource.xml.in
+++ b/data/icons/icons.gresource.xml.in
@@ -1,7 +1,30 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <gresources>
   <gresource prefix="@PREFIX@/icons/scalable/actions">
-    <file>collection-symbolic.svg</file>
+    <file>apply-symbolic.svg</file>
+    <file>cancel-symbolic.svg</file>
     <file>filter-symbolic.svg</file>
+    <!-- Categories -->
+    <file>collection-symbolic.svg</file>
+    <file>ball-symbolic.svg</file>
+    <file>car-symbolic.svg</file>
+    <file>city-symbolic.svg</file>
+    <file>fist-symbolic.svg</file>
+    <file>flashlight-symbolic.svg</file>
+    <file>gamepad-symbolic.svg</file>
+    <file>globe-symbolic.svg</file>
+    <file>gun-symbolic.svg</file>
+    <file>heart-symbolic.svg</file>
+    <file>horse-symbolic.svg</file>
+    <file>knife-symbolic.svg</file>
+    <file>map-symbolic.svg</file>
+    <file>music-symbolic.svg</file>
+    <file>people-symbolic.svg</file>
+    <file>private-symbolic.svg</file>
+    <file>puzzle-symbolic.svg</file>
+    <file>skull-symbolic.svg</file>
+    <file>sprout-symbolic.svg</file>
+    <file>star-symbolic.svg</file>
+    <file>step-over-symbolic.svg</file>
   </gresource>
 </gresources>
diff --git a/data/icons/knife-symbolic.svg b/data/icons/knife-symbolic.svg
new file mode 100644
index 0000000..dbfcd4e
--- /dev/null
+++ b/data/icons/knife-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M14.285.582a1.5 1.5 0 0 0-1.015.441L9.734 4.56l1.414 1.414 2.536-2.535a1.5 1.5 0 1 0 .601-2.856M9.027 5.266.543 13.754c.707.703 5.656 1.41 12.02-4.953zm0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/map-symbolic.svg b/data/icons/map-symbolic.svg
new file mode 100644
index 0000000..8104245
--- /dev/null
+++ b/data/icons/map-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M15 2v10l-5 3-5-3-5 3V5l5-3 5 3zM5 3v8l5 3V6zm0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/music-symbolic.svg b/data/icons/music-symbolic.svg
new file mode 100644
index 0000000..90f658c
--- /dev/null
+++ b/data/icons/music-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:gpa="https://www.gtk.org/grappa" gpa:keywords="folder-music note folder sound tune audio-x-generic" gpa:state="0" gpa:version="1" width="16" height="16"><path fill="none" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M14 11.485V4a2 2 0 0 0-2-2H8a2 2 0 0 0-2 2l.001 7.539M14 11.485a2.485 2.485 0 1 1-4.97 0 2.485 2.485 0 0 1 4.97 0m-7.999.054C6.001 12.91 4.86 14 3.487 14a2.485 2.485 0 0 1 0-4.97C4.859 9.03 6 10.166 6 11.539" class="foreground-stroke transparent-fill"/></svg>
\ No newline at end of file
diff --git a/data/icons/people-symbolic.svg b/data/icons/people-symbolic.svg
new file mode 100644
index 0000000..247c1ed
--- /dev/null
+++ b/data/icons/people-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:gpa="https://www.gtk.org/grappa" gpa:keywords="people human person user account system-users" gpa:state="0" gpa:version="1" width="16" height="16"><path fill="none" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M2.282 8A3.04 3.04 0 0 0 1 10.499V12h2m2-5.557a2.722 2.722 0 1 1 2.175-4.358M6.203 11a3.04 3.04 0 0 0-1.282 2.499V15H15v-1.501c0-1.12-.588-2.096-1.459-2.613m-.82-3.164a2.722 2.722 0 1 1-5.443 0 2.722 2.722 0 0 1 5.444 0" class="foreground-stroke transparent-fill"/></svg>
\ No newline at end of file
diff --git a/data/icons/private-symbolic.svg b/data/icons/private-symbolic.svg
new file mode 100644
index 0000000..00c39a4
--- /dev/null
+++ b/data/icons/private-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:gpa="https://www.gtk.org/grappa" gpa:keywords="privacy private window session browser hat glasses tracking" gpa:state="1" gpa:version="1" width="16" height="16"><path gpa:fill="none" gpa:stroke="foreground" gpa:stroke-width="0.5 2 3" fill="none" stroke="url(&quot;#gpa:foreground&quot;) rgb(0,0,0)" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="m4 7 .66-3.297a2.123 2.123 0 0 1 4.033-.42L9 4a1.503 1.503 0 0 1 2.89.041L13 7M2 7h12" class="transparent-fill foreground-stroke"/><path gpa:fill="none" gpa:stroke="foreground" gpa:stroke-width="0.25 0.999998 1.5" fill="none" stroke="url(&quot;#gpa:foreground&quot;) rgb(0,0,0)" stroke-linejoin="round" d="M6.475 11.643c.18-.775.887-1.123 1.584-1.123.696 0 1.312.48 1.468 1.152m3.973-.162a1.99 1.99 0 1 1-3.98 0 1.99 1.99 0 0 1 3.98 0Zm-7.02 0a1.99 1.99 0 1 1-3.98 0 1.99 1.99 0 0 1 3.98 0Z" class="transparent-fill foreground-stroke"/></svg>
\ No newline at end of file
diff --git a/data/icons/puzzle-symbolic.svg b/data/icons/puzzle-symbolic.svg
new file mode 100644
index 0000000..8fb8132
--- /dev/null
+++ b/data/icons/puzzle-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M6.5 1C5.668 1 5 1.668 5 2.5V4H2c-.555 0-1 .445-1 1v3h1.5C3.332 8 4 8.668 4 9.5S3.332 11 2.5 11H1v3c0 .555.445 1 1 1h3v-1.5c0-.832.668-1.5 1.5-1.5s1.5.668 1.5 1.5V15h3c.555 0 1-.445 1-1v-3h1.5c.832 0 1.5-.668 1.5-1.5S14.332 8 13.5 8H12V5c0-.555-.445-1-1-1H8V2.5C8 1.668 7.332 1 6.5 1m0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/skull-symbolic.svg b/data/icons/skull-symbolic.svg
new file mode 100644
index 0000000..f170cd3
--- /dev/null
+++ b/data/icons/skull-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><g fill="#222"><path d="M0 7c0 2.414 1.059 3.66 2.5 4.492l-.5-.867V13.5C2 14.883 3.117 16 4.5 16S7 14.883 7 13.5V13H5v.5C5 14.883 6.117 16 7.5 16s2.5-1.117 2.5-2.5V13H8v.5c0 1.383 1.117 2.5 2.5 2.5s2.5-1.117 2.5-2.496l.008-1.938-.559.895C15.391 11.016 16 9.328 16 7c0-3.957-3.656-7-8-7-4.348 0-8 3.043-8 7m14 0c0 .934-.105 1.547-.41 2.063-.3.515-.86 1.03-2.024 1.605q-.274.133-.554.254L11 13.5c0 .293-.207.5-.5.5s-.5-.207-.5-.5V13H8v.5c0 .293-.207.5-.5.5s-.5-.207-.5-.5V13H5v.5c0 .293-.207.5-.5.5s-.5-.207-.5-.5v-3.48a8 8 0 0 1-.5-.262c-.508-.293-.852-.586-1.094-.977S2 7.863 2 7c0-2.7 2.582-5 6-5s6 2.3 6 5m0 0"/><path fill-rule="evenodd" d="M6 7c0 .55-.45 1-1 1s-1-.45-1-1 .45-1 1-1 1 .45 1 1m6 0c0 .55-.45 1-1 1s-1-.45-1-1 .45-1 1-1 1 .45 1 1m0 0"/></g></svg>
\ No newline at end of file
diff --git a/data/icons/sprout-symbolic.svg b/data/icons/sprout-symbolic.svg
new file mode 100644
index 0000000..6e0053c
--- /dev/null
+++ b/data/icons/sprout-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M15 0c-3.512 0-6.312 1.434-6.89 4.668C6.925 2.84 4.671 2 2 2c-.55 0-1 .45-1 1 0 4.328 2.613 6.95 6 6.71V14H3c-.55 0-1 .45-1 1s.45 1 1 1h10c.55 0 1-.45 1-1s-.45-1-1-1H9V8c4.91 0 7-2.21 7-7 0-.55-.45-1-1-1m-1.043 2.055c-.113 1.375-.477 2.261-1.043 2.832-.57.582-1.476.96-2.914 1.078 0-.754.133-1.352.352-1.828.222-.485.53-.856.937-1.168.637-.477 1.547-.793 2.668-.914M3.067 4.059c1.109.12 2.007.441 2.64.921.406.317.715.692.938 1.176.19.422.316.93.347 1.551-1.039.11-1.89-.176-2.566-.77-.668-.59-1.184-1.542-1.36-2.878m0 0"/></svg>
\ No newline at end of file
diff --git a/data/icons/star-symbolic.svg b/data/icons/star-symbolic.svg
new file mode 100644
index 0000000..2474840
--- /dev/null
+++ b/data/icons/star-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:gpa="https://www.gtk.org/grappa" gpa:keywords="starred" gpa:state="1" gpa:version="1" width="16" height="16"><path gpa:fill="foreground" gpa:states="1" d="M4.556 9.172 1.39 6.92a.864.864 0 0 1 .503-1.567l4.01.013 1.246-3.74a.896.896 0 0 1 1.702.005l1.201 3.688 4.056.015a.873.873 0 0 1 .501 1.585l-3.17 2.253 1.302 3.612a.912.912 0 0 1-1.355 1.072L8.04 11.672l-3.349 2.185a.929.929 0 0 1-1.385-1.084Z" class="foreground-fill"/></svg>
\ No newline at end of file
diff --git a/data/icons/step-over-symbolic.svg b/data/icons/step-over-symbolic.svg
new file mode 100644
index 0000000..3d77715
--- /dev/null
+++ b/data/icons/step-over-symbolic.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M7 2.926c-4.043 0-5.895 3.613-5.895 3.613l1.786.902S4.14 4.926 7 4.926c2.055 0 3.098 1.394 3.484 2.074h-.91C8.242 7 8 8.254 8 9.035l6-.047.043-6c-1.043 0-2.031.524-2.031 1.668v.93l-.063.062C11.191 4.558 9.633 2.926 7 2.926M2.383 8.988c-.688 0-1.266.582-1.266 1.266v3.469c0 .683.578 1.265 1.266 1.265h3.469c.683 0 1.265-.582 1.265-1.265v-3.47c0-.683-.582-1.265-1.265-1.265zm.734 2h2v2h-2zm0 0"/></svg>
\ No newline at end of file
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 6cca4ad..c877ff6 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -6,6 +6,8 @@ cartridges/sources/__init__.py
 cartridges/sources/heroic.py
 cartridges/sources/imported.py
 cartridges/sources/steam.py
+cartridges/ui/collection-details.blp
+cartridges/ui/collection_details.py
 cartridges/ui/collections.py
 cartridges/ui/cover.blp
 cartridges/ui/cover.py