diff --git a/packages/sts-like-viewer/src/scenes/IndexScene.ts b/packages/sts-like-viewer/src/scenes/IndexScene.ts
index 26d7bc8..c097614 100644
--- a/packages/sts-like-viewer/src/scenes/IndexScene.ts
+++ b/packages/sts-like-viewer/src/scenes/IndexScene.ts
@@ -49,6 +49,11 @@ export class IndexScene extends ReactiveScene {
         scene: SceneKey.ShapeViewerScene,
         y: centerY + 140,
       },
+      {
+        label: "Inventory Test",
+        scene: SceneKey.InventoryTestScene,
+        y: centerY + 210,
+      },
     ];
 
     for (const btn of buttons) {
diff --git a/packages/sts-like-viewer/src/scenes/InventoryTestScene.ts b/packages/sts-like-viewer/src/scenes/InventoryTestScene.ts
new file mode 100644
index 0000000..07ec183
--- /dev/null
+++ b/packages/sts-like-viewer/src/scenes/InventoryTestScene.ts
@@ -0,0 +1,227 @@
+import { ReactiveScene } from "boardgame-phaser";
+import { createButton } from "@/utils/createButton";
+import { GRID_CONFIG, ITEM_COLORS } from "@/config";
+import { createInventorySignal } from "@/state/inventory";
+import {
+  createItemIn,
+  data,
+  type GameItemMeta,
+} from "boardgame-core/samples/slay-the-spire-like";
+import type { InventorySignal } from "@/state/inventory";
+import type { InventoryItem } from "boardgame-core/samples/slay-the-spire-like";
+import { SceneKey } from "./types";
+
+export class InventoryTestScene extends ReactiveScene {
+  private inventorySignal!: InventorySignal;
+  private gridOffsetX = 0;
+  private gridOffsetY = 0;
+
+  constructor() {
+    super("InventoryTestScene");
+  }
+
+  create(): void {
+    super.create();
+
+    this.inventorySignal = createInventorySignal();
+
+    const { width, height } = this.scale;
+    this.gridOffsetX =
+      (width - GRID_CONFIG.WIDTH * GRID_CONFIG.VIEWER_CELL_SIZE) / 2;
+    this.gridOffsetY =
+      (height - GRID_CONFIG.HEIGHT * GRID_CONFIG.VIEWER_CELL_SIZE) / 2 + 40;
+
+    this.drawGrid();
+    this.drawItems();
+
+    this.add
+      .text(width / 2, 30, "Inventory Signal Test (4x6)", {
+        fontSize: "24px",
+        color: "#ffffff",
+        fontStyle: "bold",
+      })
+      .setOrigin(0.5);
+
+    this.createControls();
+
+    this.add
+      .text(width / 2, height - 40, "Items update reactively via signals", {
+        fontSize: "14px",
+        color: "#aaaaaa",
+      })
+      .setOrigin(0.5);
+
+    // React to inventory changes by re-rendering
+    this.addEffect(() => {
+      const inventory = this.inventorySignal.value;
+      // Track item count for reactivity
+      const itemCount = inventory.items.size;
+      return () => {};
+    });
+  }
+
+  private drawGrid(): void {
+    const graphics = this.add.graphics();
+
+    for (let y = 0; y < GRID_CONFIG.HEIGHT; y++) {
+      for (let x = 0; x < GRID_CONFIG.WIDTH; x++) {
+        const px = this.gridOffsetX + x * GRID_CONFIG.VIEWER_CELL_SIZE;
+        const py = this.gridOffsetY + y * GRID_CONFIG.VIEWER_CELL_SIZE;
+
+        graphics.fillStyle(0x222233);
+        graphics.fillRect(
+          px + 1,
+          py + 1,
+          GRID_CONFIG.VIEWER_CELL_SIZE - 2,
+          GRID_CONFIG.VIEWER_CELL_SIZE - 2,
+        );
+        graphics.lineStyle(1, 0x555577);
+        graphics.strokeRect(
+          px,
+          py,
+          GRID_CONFIG.VIEWER_CELL_SIZE,
+          GRID_CONFIG.VIEWER_CELL_SIZE,
+        );
+      }
+    }
+  }
+
+  private drawItems(): void {
+    const inventory = this.inventorySignal.value;
+    for (const [itemId, item] of inventory.items) {
+      this.drawItem(itemId, item);
+    }
+  }
+
+  private drawItem(itemId: string, item: InventoryItem<GameItemMeta>): void {
+    const shape = item.shape;
+    const transform = item.transform;
+
+    const cells: { x: number; y: number }[] = [];
+    for (let y = 0; y < shape.height; y++) {
+      for (let x = 0; x < shape.width; x++) {
+        if (shape.grid[y]?.[x]) {
+          const finalX = x + transform.offset.x;
+          const finalY = y + transform.offset.y;
+          cells.push({ x: finalX, y: finalY });
+        }
+      }
+    }
+
+    const itemColor = this.getItemColor(itemId);
+    const graphics = this.add.graphics();
+
+    for (const cell of cells) {
+      const px = this.gridOffsetX + cell.x * GRID_CONFIG.VIEWER_CELL_SIZE;
+      const py = this.gridOffsetY + cell.y * GRID_CONFIG.VIEWER_CELL_SIZE;
+
+      graphics.fillStyle(itemColor);
+      graphics.fillRect(
+        px + 2,
+        py + 2,
+        GRID_CONFIG.VIEWER_CELL_SIZE - 4,
+        GRID_CONFIG.VIEWER_CELL_SIZE - 4,
+      );
+    }
+
+    if (cells.length > 0) {
+      const firstCell = cells[0];
+      const px = this.gridOffsetX + firstCell.x * GRID_CONFIG.VIEWER_CELL_SIZE;
+      const py = this.gridOffsetY + firstCell.y * GRID_CONFIG.VIEWER_CELL_SIZE;
+      const itemName = item.meta?.itemData.name ?? item.id;
+
+      this.add
+        .text(
+          px + GRID_CONFIG.VIEWER_CELL_SIZE / 2,
+          py + GRID_CONFIG.VIEWER_CELL_SIZE / 2,
+          itemName,
+          {
+            fontSize: "11px",
+            color: "#ffffff",
+            fontStyle: "bold",
+          },
+        )
+        .setOrigin(0.5);
+    }
+  }
+
+  private getItemColor(itemId: string): number {
+    const hash = itemId.split("").reduce((acc, c) => acc + c.charCodeAt(0), 0);
+    return ITEM_COLORS[hash % ITEM_COLORS.length];
+  }
+
+  private createControls(): void {
+    const { width } = this.scale;
+
+    createButton({
+      scene: this,
+      label: "返回菜单",
+      x: 100,
+      y: 40,
+      onClick: async () => {
+        await this.sceneController.launch(SceneKey.IndexScene);
+      },
+    });
+
+    createButton({
+      scene: this,
+      label: "添加道具",
+      x: width - 300,
+      y: 40,
+      onClick: () => {
+        this.addRandomItem();
+      },
+    });
+
+    createButton({
+      scene: this,
+      label: "移除最后一个",
+      x: width - 150,
+      y: 40,
+      onClick: () => {
+        this.removeLastItem();
+      },
+    });
+  }
+
+  private addRandomItem(): void {
+    const items = data.desert.getItems();
+
+    this.inventorySignal.produce((inventory) => {
+      const usedIndices = new Set<number>();
+
+      for (const item of inventory.items.values()) {
+        const match = item.id.match(/^item-(\d+)-/);
+        if (match) {
+          usedIndices.add(parseInt(match[1], 10));
+        }
+      }
+
+      let availableIndex = 0;
+      while (usedIndices.has(availableIndex) && availableIndex < items.length) {
+        availableIndex++;
+      }
+
+      if (availableIndex >= items.length) {
+        return;
+      }
+
+      const itemData = items[availableIndex];
+      const id = `item-${availableIndex}-${Date.now().toString(16).slice(-4)}`;
+      createItemIn(inventory, id, itemData);
+    });
+  }
+
+  private removeLastItem(): void {
+    this.inventorySignal.produce((inventory) => {
+      const items = Array.from(inventory.items.entries());
+
+      if (items.length === 0) {
+        return;
+      }
+
+      const [lastId] = items[items.length - 1];
+      inventory.items.delete(lastId);
+    });
+  }
+}
diff --git a/packages/sts-like-viewer/src/scenes/types.ts b/packages/sts-like-viewer/src/scenes/types.ts
index 8ee15a8..9c00f55 100644
--- a/packages/sts-like-viewer/src/scenes/types.ts
+++ b/packages/sts-like-viewer/src/scenes/types.ts
@@ -1,6 +1,7 @@
 export enum SceneKey {
   GridViewerScene = "GridViewerScene",
   IndexScene = "IndexScene",
+  InventoryTestScene = "InventoryTestScene",
   MapViewerScene = "MapViewerScene",
   ShapeViewerScene = "ShapeViewerScene",
 }
diff --git a/packages/sts-like-viewer/src/state/inventory.ts b/packages/sts-like-viewer/src/state/inventory.ts
new file mode 100644
index 0000000..2010d5c
--- /dev/null
+++ b/packages/sts-like-viewer/src/state/inventory.ts
@@ -0,0 +1,24 @@
+import { mutableSignal } from "boardgame-core";
+import {
+  createGridInventory,
+  createItemIn,
+  data,
+  GameItemMeta,
+} from "boardgame-core/samples/slay-the-spire-like";
+
+function genId() {
+  return Math.random().toString(16).slice(-8);
+}
+
+export type InventorySignal = ReturnType<typeof createInventorySignal>;
+
+export function createInventorySignal() {
+  const inventory = createGridInventory<GameItemMeta>(4, 6);
+
+  const startingItems = data.desert.getStartingItems();
+  for (const data of startingItems) {
+    createItemIn(inventory, `${data.id}-${genId()}`, data);
+  }
+
+  return mutableSignal(inventory);
+}