diff --git a/src/common/rpg/components/combat.ts b/src/common/rpg/components/combat.ts
index 57888cb..fd25e43 100644
--- a/src/common/rpg/components/combat.ts
+++ b/src/common/rpg/components/combat.ts
@@ -1,5 +1,5 @@
-import { component } from "../core/registry";
 import { Component } from "../core/world";
+import { component } from "../utils/decorators";
 import { Stat } from "./stat";
 
 @component
diff --git a/src/common/rpg/components/cooldown.ts b/src/common/rpg/components/cooldown.ts
index 0e8c6bf..a1e5cab 100644
--- a/src/common/rpg/components/cooldown.ts
+++ b/src/common/rpg/components/cooldown.ts
@@ -1,6 +1,5 @@
-import { component } from "../core/registry";
 import { Component } from "../core/world";
-import { action, variable } from "../utils/decorators";
+import { action, component, variable } from "../utils/decorators";
 
 @component
 export class Cooldown extends Component<{
diff --git a/src/common/rpg/components/effect.ts b/src/common/rpg/components/effect.ts
index 8a0cc94..d87ceb7 100644
--- a/src/common/rpg/components/effect.ts
+++ b/src/common/rpg/components/effect.ts
@@ -1,7 +1,6 @@
-import { component } from "../core/registry";
 import { Component, type EvalContext } from "../core/world";
 import { evaluateCondition } from "../utils/conditions";
-import { action, variable } from "../utils/decorators";
+import { action, component, variable } from "../utils/decorators";
 import { Stat } from "./stat";
 
 @component
diff --git a/src/common/rpg/components/equipment.ts b/src/common/rpg/components/equipment.ts
index 26f0182..17ba671 100644
--- a/src/common/rpg/components/equipment.ts
+++ b/src/common/rpg/components/equipment.ts
@@ -1,9 +1,7 @@
-import { component } from "../core/registry";
 import { Component } from "../core/world";
-import { action } from "../utils/decorators";
 import type { RPGVariables } from "../types";
+import { action, component } from "../utils/decorators";
 import { Effect } from "./effect";
-import { Damage } from "./combat";
 
 // ── Equippable ────────────────────────────────────────────────────────────────
 
diff --git a/src/common/rpg/components/experience.ts b/src/common/rpg/components/experience.ts
index 8c1b6e7..32dcd8d 100644
--- a/src/common/rpg/components/experience.ts
+++ b/src/common/rpg/components/experience.ts
@@ -1,6 +1,5 @@
-import { component } from "../core/registry";
 import { Component } from "../core/world";
-import { action, variable } from "../utils/decorators";
+import { action, component, variable } from "../utils/decorators";
 
 /**
  * How much XP is required to advance from level N to N+1.
diff --git a/src/common/rpg/components/faction.ts b/src/common/rpg/components/faction.ts
index b8eeafc..795211d 100644
--- a/src/common/rpg/components/faction.ts
+++ b/src/common/rpg/components/faction.ts
@@ -1,7 +1,6 @@
-import { component } from "../core/registry";
 import { Component, type Entity } from "../core/world";
 import type { RPGVariables } from "../types";
-import { action } from "../utils/decorators";
+import { action, component } from "../utils/decorators";
 
 // ── FactionMember ─────────────────────────────────────────────────────────────
 
diff --git a/src/common/rpg/components/inventory.ts b/src/common/rpg/components/inventory.ts
index ee33b78..5b6730b 100644
--- a/src/common/rpg/components/inventory.ts
+++ b/src/common/rpg/components/inventory.ts
@@ -1,10 +1,9 @@
-import type { InventorySlotInput, RPGVariables, SlotId } from "../types";
-import { action } from "../utils/decorators";
 import { Component, type EvalContext } from "../core/world";
-import { component } from "../core/registry";
-import { Stackable, Usable } from "./item";
-import { Equipment, Equippable } from "./equipment";
+import type { InventorySlotInput, RPGVariables, SlotId } from "../types";
+import { action, component } from "../utils/decorators";
 import { resolveVariables } from "../utils/variables";
+import { Equipment, Equippable } from "./equipment";
+import { Stackable, Usable } from "./item";
 
 interface SlotRecord {
     slotId: SlotId;
diff --git a/src/common/rpg/components/item.ts b/src/common/rpg/components/item.ts
index 3bf269b..08c4eaa 100644
--- a/src/common/rpg/components/item.ts
+++ b/src/common/rpg/components/item.ts
@@ -1,7 +1,6 @@
 import { Component, type EvalContext, type World } from "../core/world";
-import { component } from "../core/registry";
 import type { RPGAction } from "../types";
-import { action, variable } from "../utils/decorators";
+import { action, component, variable } from "../utils/decorators";
 import { executeAction } from "../utils/variables";
 import { Equippable } from "./equipment";
 
diff --git a/src/common/rpg/components/position.ts b/src/common/rpg/components/position.ts
new file mode 100644
index 0000000..ed760c7
--- /dev/null
+++ b/src/common/rpg/components/position.ts
@@ -0,0 +1,9 @@
+import { Component } from "../core/world";
+import { component } from "../utils/decorators";
+
+@component({ variables: ['x', 'y', 'z'] })
+export class Position extends Component<{ x: number, y: number, z: number }> {
+    constructor(x = 0, y = 0, z = 0) {
+        super({ x, y, z });
+    }
+}
\ No newline at end of file
diff --git a/src/common/rpg/components/questLog.ts b/src/common/rpg/components/questLog.ts
index e0b5e3a..36d3f5c 100644
--- a/src/common/rpg/components/questLog.ts
+++ b/src/common/rpg/components/questLog.ts
@@ -1,7 +1,7 @@
 import { Component, type EvalContext } from "../core/world";
-import { component } from "../core/registry";
 import { isQuest, type Quest, type QuestStage, type RPGVariables } from "../types";
 import { evaluateCondition } from "../utils/conditions";
+import { component } from "../utils/decorators";
 
 export type QuestStatus = 'inactive' | 'active' | 'completed' | 'failed';
 
diff --git a/src/common/rpg/components/stat.ts b/src/common/rpg/components/stat.ts
index 3f96c7d..cedc723 100644
--- a/src/common/rpg/components/stat.ts
+++ b/src/common/rpg/components/stat.ts
@@ -1,6 +1,5 @@
-import { action, variable } from "../utils/decorators";
 import { Component } from "../core/world";
-import { component } from "../core/registry";
+import { action, component, variable } from "../utils/decorators";
 
 interface StatState {
     base: number;
diff --git a/src/common/rpg/components/variables.ts b/src/common/rpg/components/variables.ts
index f11185f..1597a21 100644
--- a/src/common/rpg/components/variables.ts
+++ b/src/common/rpg/components/variables.ts
@@ -1,7 +1,6 @@
-import type { RPGVariables } from "../types";
-import { action } from "../utils/decorators";
 import { Component } from "../core/world";
-import { component } from "../core/registry";
+import type { RPGVariables } from "../types";
+import { action, component } from "../utils/decorators";
 
 interface Var {
     key: string;
diff --git a/src/common/rpg/core/registry.ts b/src/common/rpg/core/registry.ts
deleted file mode 100644
index 3d9f945..0000000
--- a/src/common/rpg/core/registry.ts
+++ /dev/null
@@ -1,100 +0,0 @@
-import type { Component } from './world';
-
-type ComponentConstructor = abstract new (...args: any[]) => Component<any>;
-type MigrationFn = (state: Record<string, unknown>) => Record<string, unknown>;
-
-interface ComponentMeta {
-    ctor: ComponentConstructor;
-    version: number;
-}
-
-interface MigrationEntry {
-    toVersion: number;
-    fn: MigrationFn;
-}
-
-const registry = new Map<string, ComponentMeta>();
-const reverseRegistry = new Map<ComponentConstructor, string>();
-/** migrations[name][fromVersion] → { toVersion, fn } */
-const migrations = new Map<string, Map<number, MigrationEntry>>();
-
-function register(name: string, ctor: ComponentConstructor, version: number): void {
-    registry.set(name, { ctor, version });
-    reverseRegistry.set(ctor, name);
-}
-
-export function getComponentMeta(name: string): ComponentMeta | undefined {
-    return registry.get(name);
-}
-
-export function getComponentName(ctor: Function): string | undefined {
-    return reverseRegistry.get(ctor as ComponentConstructor);
-}
-
-/**
- * Register a migration that upgrades component state from `fromVersion` to `toVersion`.
- * Migrations are chained automatically: registering 0→1 and 1→2 handles saves at version 0.
- */
-export function registerMigration(
-    name: string,
-    fromVersion: number,
-    toVersion: number,
-    fn: MigrationFn,
-): void {
-    if (!migrations.has(name)) migrations.set(name, new Map());
-    migrations.get(name)!.set(fromVersion, { toVersion, fn });
-}
-
-/**
- * Apply all registered migrations to bring `state` from `fromVersion` up to the current
- * registered version. Returns the migrated state (may be the same object if no migrations ran).
- */
-export function migrateState(
-    name: string,
-    state: Record<string, unknown>,
-    fromVersion: number,
-): Record<string, unknown> {
-    const meta = registry.get(name);
-    if (!meta) return state;
-    const chain = migrations.get(name);
-    if (!chain) return state;
-    let current = fromVersion;
-    let s = state;
-    while (current < meta.version) {
-        const entry = chain.get(current);
-        if (!entry) throw new Error(
-            `[registry] No migration for '${name}' from version ${current} to ${meta.version}. ` +
-            `Register one with registerMigration('${name}', ${current}, ...).`
-        );
-        s = entry.fn(s);
-        current = entry.toVersion;
-    }
-    return s;
-}
-
-interface ComponentOptions {
-    name?: string;
-    version?: number;
-}
-
-type ComponentDecorator = (target: ComponentConstructor, ctx: ClassDecoratorContext) => void;
-
-export function component(target: ComponentConstructor, ctx: ClassDecoratorContext): void;
-export function component(name: string): ComponentDecorator;
-export function component(options: ComponentOptions): ComponentDecorator;
-export function component(
-    nameOrTargetOrOptions: string | ComponentConstructor | ComponentOptions,
-    ctx?: ClassDecoratorContext,
-): void | ComponentDecorator {
-    if (typeof nameOrTargetOrOptions === 'string') {
-        const name = nameOrTargetOrOptions;
-        return (target: ComponentConstructor) => register(name, target, 0);
-    }
-    if (typeof nameOrTargetOrOptions === 'object') {
-        const { name, version = 0 } = nameOrTargetOrOptions;
-        return (target: ComponentConstructor, ctx: ClassDecoratorContext) =>
-            register(name ?? String(ctx.name), target, version);
-    }
-    // Used as bare @component
-    register(String(ctx!.name), nameOrTargetOrOptions, 0);
-}
diff --git a/src/common/rpg/core/serialization.ts b/src/common/rpg/core/serialization.ts
index 1ada8bd..15db427 100644
--- a/src/common/rpg/core/serialization.ts
+++ b/src/common/rpg/core/serialization.ts
@@ -1,5 +1,5 @@
 import { World, Entity, Component, WORLD_ENTITY_COUNTER } from './world';
-import { getComponentMeta, getComponentName, migrateState } from './registry';
+import { getComponentMeta, getComponentName, migrateState } from '../utils/decorators';
 
 /** Increment this when the WorldData/EntityData structure itself changes incompatibly. */
 const SCHEMA_VERSION = 1;
diff --git a/src/common/rpg/core/world.ts b/src/common/rpg/core/world.ts
index f472110..1ba7b9b 100644
--- a/src/common/rpg/core/world.ts
+++ b/src/common/rpg/core/world.ts
@@ -1,6 +1,5 @@
-import { ACTION_KEYS, VARIABLE_KEYS } from '../utils/decorators';
 import type { RPGActions, RPGVariables } from '../types';
-import { getComponentName } from './registry';
+import { ACTION_KEYS, getComponentName, STATE_KEYS, VARIABLE_KEYS } from '../utils/decorators';
 
 interface EntityEvent<T = unknown> {
     target: Entity;
@@ -59,12 +58,22 @@ export abstract class Component<TState = Record<string, unknown>> {
     getVariables(): RPGVariables {
         const meta = (this.constructor as Function)[Symbol.metadata];
         const keys = meta?.[VARIABLE_KEYS] as Map<string | symbol, string> | undefined;
-        if (!keys) return {};
+        const stateKeys = meta?.[STATE_KEYS] as Set<string> | undefined;
         const vars: RPGVariables = {};
-        for (const [methodKey, exportName] of keys) {
-            const v = (this as Record<string, unknown>)[String(methodKey)];
-            if (typeof v === 'number' || typeof v === 'string' || typeof v === 'boolean') {
-                vars[exportName] = v;
+        if (keys) {
+            for (const [methodKey, exportName] of keys) {
+                const v = (this as Record<string, unknown>)[String(methodKey)];
+                if (typeof v === 'number' || typeof v === 'string' || typeof v === 'boolean') {
+                    vars[exportName] = v;
+                }
+            }
+        }
+        if (stateKeys) {
+            for (const key of stateKeys) {
+                const v = (this._state as Record<string, unknown>)[String(key)];
+                if (typeof v === 'number' || typeof v === 'string' || typeof v === 'boolean') {
+                    vars[key] = v;
+                }
             }
         }
         return vars;
diff --git a/src/common/rpg/utils/decorators.ts b/src/common/rpg/utils/decorators.ts
index 1bca716..fc4f2cd 100644
--- a/src/common/rpg/utils/decorators.ts
+++ b/src/common/rpg/utils/decorators.ts
@@ -1,3 +1,4 @@
+import type { Component } from "../core/world";
 import type { RPGVariables } from "../types";
 
 // TC39 stage-3 decorators use Symbol.metadata; polyfill for runtimes that lack it (e.g. Bun).
@@ -5,6 +6,7 @@ import type { RPGVariables } from "../types";
 
 export const ACTION_KEYS = Symbol('rpg.actions');
 export const VARIABLE_KEYS = Symbol('rpg.variables');
+export const STATE_KEYS = Symbol('rpg.state_variables');
 
 export function action<T extends (arg?: any, ctx?: any) => unknown>(
     target: T,
@@ -12,18 +14,23 @@ export function action<T extends (arg?: any, ctx?: any) => unknown>(
 ): T {
     const prev = context.metadata[ACTION_KEYS] as Set<string | symbol> | undefined;
     context.metadata[ACTION_KEYS] = new Set(prev).add(context.name);
-    return function(this: any, arg?: any, ctx?: any) {
+    return function (this: any, arg?: any, ctx?: any) {
         return target.call(this, arg, ctx ?? this.context);
     } as unknown as T;
 }
 
 type VariableContext<T extends RPGVariables[string]> =
     | ClassFieldDecoratorContext<unknown, T>
-    | ClassGetterDecoratorContext<unknown, T>;
+    | ClassGetterDecoratorContext<unknown, T>
+    | ClassDecoratorContext;
 
-function registerVariable(context: VariableContext<RPGVariables[string]>, exportName: string): void {
+function registerVariable(context: VariableContext<RPGVariables[string]>, exportName: string, name?: string): void {
     const prev = context.metadata[VARIABLE_KEYS] as Map<string | symbol, string> | undefined;
-    context.metadata[VARIABLE_KEYS] = new Map(prev).set(context.name, exportName);
+    context.metadata[VARIABLE_KEYS] = new Map(prev).set(name ?? context.name ?? exportName, exportName);
+}
+function registerStateVariable(context: VariableContext<RPGVariables[string]>, name: string): void {
+    const prev = context.metadata[STATE_KEYS] as Set<string> | undefined;
+    context.metadata[STATE_KEYS] = new Set(prev).add(name);
 }
 
 export function variable(name: string): <T extends RPGVariables[string]>(target: undefined | (() => T), context: VariableContext<T>) => void;
@@ -41,3 +48,107 @@ export function variable(
     }
     registerVariable(context!, String(context!.name));
 }
+type ComponentConstructor<T> = abstract new (...args: any[]) => Component<T>;
+type MigrationFn = (state: Record<string, unknown>) => Record<string, unknown>;
+
+interface ComponentMeta<T> {
+    ctor: ComponentConstructor<T>;
+    version: number;
+}
+
+interface MigrationEntry {
+    toVersion: number;
+    fn: MigrationFn;
+}
+
+const registry = new Map<string, ComponentMeta<any>>();
+const reverseRegistry = new Map<ComponentConstructor<any>, string>();
+/** migrations[name][fromVersion] → { toVersion, fn } */
+const migrations = new Map<string, Map<number, MigrationEntry>>();
+
+function register<T>(name: string, ctor: ComponentConstructor<T>, version: number): void {
+    registry.set(name, { ctor, version });
+    reverseRegistry.set(ctor, name);
+}
+
+export function getComponentMeta<T>(name: string): ComponentMeta<T> | undefined {
+    return registry.get(name);
+}
+
+export function getComponentName(ctor: Function): string | undefined {
+    return reverseRegistry.get(ctor as ComponentConstructor<any>);
+}
+
+/**
+ * Register a migration that upgrades component state from `fromVersion` to `toVersion`.
+ * Migrations are chained automatically: registering 0→1 and 1→2 handles saves at version 0.
+ */
+export function registerMigration(
+    name: string,
+    fromVersion: number,
+    toVersion: number,
+    fn: MigrationFn,
+): void {
+    if (!migrations.has(name)) migrations.set(name, new Map());
+    migrations.get(name)!.set(fromVersion, { toVersion, fn });
+}
+
+/**
+ * Apply all registered migrations to bring `state` from `fromVersion` up to the current
+ * registered version. Returns the migrated state (may be the same object if no migrations ran).
+ */
+export function migrateState(
+    name: string,
+    state: Record<string, unknown>,
+    fromVersion: number,
+): Record<string, unknown> {
+    const meta = registry.get(name);
+    if (!meta) return state;
+    const chain = migrations.get(name);
+    if (!chain) return state;
+    let current = fromVersion;
+    let s = state;
+    while (current < meta.version) {
+        const entry = chain.get(current);
+        if (!entry) throw new Error(
+            `[registry] No migration for '${name}' from version ${current} to ${meta.version}. ` +
+            `Register one with registerMigration('${name}', ${current}, ...).`
+        );
+        s = entry.fn(s);
+        current = entry.toVersion;
+    }
+    return s;
+}
+
+interface ComponentOptions<T> {
+    name?: string;
+    version?: number;
+    variables?: (keyof T)[];
+}
+
+type ComponentDecorator<T> = (target: ComponentConstructor<T>, ctx: ClassDecoratorContext) => void;
+
+export function component<T>(target: ComponentConstructor<T>, ctx: ClassDecoratorContext): void;
+export function component<T>(name: string): ComponentDecorator<T>;
+export function component<T>(options: ComponentOptions<T>): ComponentDecorator<T>;
+export function component<T>(
+    nameOrTargetOrOptions: string | ComponentConstructor<T> | ComponentOptions<T>,
+    ctx?: ClassDecoratorContext,
+): void | ComponentDecorator<T> {
+    if (typeof nameOrTargetOrOptions === 'string') {
+        const name = nameOrTargetOrOptions;
+        return (target: ComponentConstructor<T>) => register(name, target, 0);
+    }
+    if (typeof nameOrTargetOrOptions === 'object') {
+        const { name, version = 0, variables = [] } = nameOrTargetOrOptions;
+        return (target: ComponentConstructor<T>, ctx: ClassDecoratorContext) => {
+            register(name ?? String(ctx.name), target, version);
+
+            for (const key of variables) {
+                registerStateVariable(ctx, String(key));
+            }
+        }
+    }
+    // Used as bare @component
+    register(String(ctx!.name), nameOrTargetOrOptions, 0);
+}
diff --git a/src/common/rpg/utils/variables.ts b/src/common/rpg/utils/variables.ts
index 4caee27..d6af5b1 100644
--- a/src/common/rpg/utils/variables.ts
+++ b/src/common/rpg/utils/variables.ts
@@ -1,7 +1,7 @@
+import type { Entity, EvalContext } from "../core/world";
+import { World } from "../core/world";
 import type { RPGAction, RPGActions, RPGVariables } from "../types";
-import { isEvalContext, World } from "../core/world";
-import type { EvalContext, Entity } from "../core/world";
-import { getComponentName } from "../core/registry";
+import { getComponentName } from "./decorators";
 
 export function resolveVariables(target: Entity | World): RPGVariables {
     const result: RPGVariables = {};
diff --git a/src/games/playground/index.tsx b/src/games/playground/index.tsx
index 3e1ac31..ea7f71b 100644
--- a/src/games/playground/index.tsx
+++ b/src/games/playground/index.tsx
@@ -10,6 +10,7 @@ import { Serialization } from "@common/rpg/core/serialization";
 import { Factions } from "@common/rpg/components/faction";
 import { Effect } from "@common/rpg/components/effect";
 import { Equipment } from "@common/rpg/components/equipment";
+import { Position } from "@common/rpg/components/position";
 
 export default async function main() {
     const world = new World();
@@ -35,6 +36,7 @@ export default async function main() {
     }]));
     player.add('str', new Stat({ value: 100 }));
     player.add('agl', new Stat({ value: 100 }));
+    player.add(new Position(42, 69));
 
     Factions.join(player, 'boobs');
     Factions.adjustReputation(player, 'guards', 10);