diff --git a/libs/constants/src/consts/map-tags.const.ts b/libs/constants/src/consts/map-tags.const.ts
new file mode 100644
index 000000000..397ae0ba8
--- /dev/null
+++ b/libs/constants/src/consts/map-tags.const.ts
@@ -0,0 +1,80 @@
+import { Gamemode, GamemodeCategory, GamemodeToGamemodeCategory } from '../';
+import { ElementOf, ValueOf } from '../types/utils/util.type';
+
+const GLOBAL_TAGS = ['Portals', 'Multiroute'] as const;
+
+// prettier-ignore
+const GAMEMODE_TAGS = {
+  [GamemodeCategory.SURF]: [
+    'Unit',
+    'Tech',
+    'Spins',
+    'Booster',
+    'Headhit',
+    'Bhop'
+  ] as const,
+  [GamemodeCategory.BHOP]: [
+    'Strafe',
+    'Tech',
+    'Fly',
+    'Surf',
+    'Weapons',
+    'Spins'
+  ] as const,
+  [GamemodeCategory.CLIMB]: [
+    'Ladder'
+  ] as const,
+  [GamemodeCategory.RJ]: [
+    'Sync',
+    'Wallpogo',
+    'Speedshot',
+    'Bounce',
+    'Jurf',
+    'Edgebug',
+    'Wallbug',
+    'Wallshot'
+  ] as const,
+  [GamemodeCategory.SJ]: [
+    'Airpogo',
+    'Wallpogo',
+    'Vert'
+  ] as const,
+  [GamemodeCategory.AHOP]: [
+    'HL2'
+  ] as const,
+  [GamemodeCategory.CONC]: [
+    'Prec',
+    'Juggle',
+    'Limited Ammo'
+  ] as const,
+  [GamemodeCategory.DEFRAG]: [
+    'Strafe',
+    'Rocket Launcher',
+    'Grenade Launcher',
+    'Plasma Gun',
+    'BFG',
+    'Combo',
+    'Haste',
+    'Damageboost',
+    'Climb',
+    'Trick'
+  ] as const
+};
+
+// We could add support for individual subcategories (Gamemodes), but don't
+// have a single example of one yet.
+
+/**
+ * Union of every possible tag in Momentum.
+ */
+export type MapTag =
+  | (typeof GLOBAL_TAGS)[number]
+  | ElementOf<ValueOf<typeof GAMEMODE_TAGS>>;
+
+// TODO: BUMP DEPS, REMOVE SPREAD!!
+export const MapTags: Map<Gamemode, Set<MapTag>> = new Map(
+  [...GamemodeToGamemodeCategory.entries()].map(([gamemode, category]) => [
+    gamemode,
+    new Set([...GLOBAL_TAGS, ...(GAMEMODE_TAGS[category] ?? [])]) as any
+  ])
+) as any;
diff --git a/libs/constants/src/enums/gamemode.enum.ts b/libs/constants/src/enums/gamemode.enum.ts
index 388116909..a27d2e701 100644
--- a/libs/constants/src/enums/gamemode.enum.ts
+++ b/libs/constants/src/enums/gamemode.enum.ts
@@ -30,3 +30,32 @@ export enum GamemodeCategory {
   CONC = 7,
   DEFRAG = 8
 }
+
+// prettier-ignore
+export const GamemodeCategoryToGamemode = new Map<GamemodeCategory, Gamemode[]>([
+  [GamemodeCategory.SURF,     [Gamemode.SURF]],
+  [GamemodeCategory.BHOP,     [Gamemode.BHOP, Gamemode.BHOP_HL1]],
+  [GamemodeCategory.CLIMB,    [Gamemode.CLIMB_MOM, Gamemode.CLIMB_KZT, Gamemode.CLIMB_16]],
+  [GamemodeCategory.RJ,       [Gamemode.RJ]],
+  [GamemodeCategory.SJ,       [Gamemode.SJ]],
+  [GamemodeCategory.AHOP,     [Gamemode.AHOP]],
+  [GamemodeCategory.CONC,     [Gamemode.CONC]],
+  [GamemodeCategory.DEFRAG,   [Gamemode.DEFRAG_CPM, Gamemode.DEFRAG_VQ3, Gamemode.DEFRAG_VTG]]
+]);
+
+// prettier-ignore
+export const GamemodeToGamemodeCategory = new Map<Gamemode, GamemodeCategory>([
+  [Gamemode.SURF,           GamemodeCategory.SURF],
+  [Gamemode.BHOP,           GamemodeCategory.BHOP],
+  [Gamemode.BHOP_HL1,       GamemodeCategory.BHOP],
+  [Gamemode.CLIMB_MOM,      GamemodeCategory.CLIMB],
+  [Gamemode.CLIMB_KZT,      GamemodeCategory.CLIMB],
+  [Gamemode.CLIMB_16,       GamemodeCategory.CLIMB],
+  [Gamemode.RJ,             GamemodeCategory.RJ],
+  [Gamemode.SJ,             GamemodeCategory.SJ],
+  [Gamemode.AHOP,           GamemodeCategory.AHOP],
+  [Gamemode.CONC,           GamemodeCategory.CONC],
+  [Gamemode.DEFRAG_CPM,     GamemodeCategory.DEFRAG],
+  [Gamemode.DEFRAG_VQ3,     GamemodeCategory.DEFRAG],
+  [Gamemode.DEFRAG_VTG,     GamemodeCategory.DEFRAG]
+]);
diff --git a/libs/constants/src/index.ts b/libs/constants/src/index.ts
index 2d711e82f..345d0ed3c 100644
--- a/libs/constants/src/index.ts
+++ b/libs/constants/src/index.ts
@@ -1,3 +1,4 @@
+export * from './consts/map-tags.const';
 export * from './consts/jwt.const';
 export * from './consts/appids.const';
 export * from './consts/file-store-paths.const';
diff --git a/libs/constants/src/types/models/models.ts b/libs/constants/src/types/models/models.ts
index ba72939ff..55b27b98f 100644
--- a/libs/constants/src/types/models/models.ts
+++ b/libs/constants/src/types/models/models.ts
@@ -15,9 +15,11 @@ import {
   AdminActivityType,
   KillswitchType,
   ReportType,
-  ReportCategory
+  ReportCategory,
+  MapTag,
+  Flags,
+  DateString
 } from '../../';
-import { Flags, DateString } from '../../';
 
 // Collection of models used throughout the codebase, as well as in Panorama.
 //
@@ -352,8 +354,6 @@ export interface MapSubmissionSuggestion {
   //  TODO: Tags!
 }
 
-export type MapTags = string[];
-
 export interface MapTestInvite {
   mapID: number;
   userID: number;
@@ -456,7 +456,7 @@ export interface Leaderboard {
   tier: number | null;
   style: Style;
   type: LeaderboardType;
-  tags: MapTags;
+  tags: MapTag[];
   linear: boolean;
 }
 
diff --git a/libs/constants/src/types/utils/util.type.ts b/libs/constants/src/types/utils/util.type.ts
new file mode 100644
index 000000000..86b32e8c8
--- /dev/null
+++ b/libs/constants/src/types/utils/util.type.ts
@@ -0,0 +1,13 @@
+/**
+ * Trivial types that are useful in many places.
+ * This package is exported to Panorama, which doesn't support type-fest, add
+ * here if needed.
+ */
+
+export type ValueOf<T> = T[keyof T];
+export type ElementOf<T> = T extends (infer E)[] ? E : never;
+
+export type KeyOfMap<T> = T extends Map<infer K, any> ? K : never;
+export type ValueOfMap<T> = T extends Map<any, infer V> ? V : never;
+
+export type ElementOfSet<T> = T extends Set<infer K> ? K : never;