diff --git a/.gitignore b/.gitignore
index 23432f4..ab02f58 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,8 @@
 
 # testing
 /coverage
+/playwright-report
+/test-results
 
 # next.js
 /.next/
diff --git a/PROJECT_AUDIT_2026-03-03.md b/PROJECT_AUDIT_2026-03-03.md
index 0754534..ef38e05 100644
--- a/PROJECT_AUDIT_2026-03-03.md
+++ b/PROJECT_AUDIT_2026-03-03.md
@@ -245,6 +245,9 @@
 ## 第二轮执行进展（2026-03-03）
 - 任务 2（清理 lint warning）：✅ 已完成
   - 结果：`npm run lint` => `0 errors / 0 warnings`。
+- 任务 3（补 E2E 用例）：✅ 已完成（代码已补齐）
+  - 新增：`playwright.config.ts`、`e2e/home-navigation.spec.ts`、`e2e/panic-join.spec.ts`、`e2e/invite-join.spec.ts`。
+  - 说明：当前环境无法访问 `registry.npmjs.org`，Playwright 依赖安装受限，`npm run test:e2e` 需在可联网环境执行。
 
 ---
 
diff --git a/README.md b/README.md
index 3da2142..fe97555 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,18 @@ npm run dev
 
 Open [http://localhost:3000](http://localhost:3000) in your browser (best viewed on mobile viewport).
 
+## Testing
+
+```bash
+npm test
+npm run test:coverage
+npm run lint
+npx tsc --noEmit
+npm run test:e2e
+```
+
+> `test:e2e` 使用 Playwright。当前仓库通过 `npx playwright test` 运行，在可联网环境会自动拉取所需依赖。
+
 ## Project Structure
 
 ```
diff --git a/TEST_SUPPLEMENT_PLAN_2026-03-03.md b/TEST_SUPPLEMENT_PLAN_2026-03-03.md
index 1ff093e..51fed10 100644
--- a/TEST_SUPPLEMENT_PLAN_2026-03-03.md
+++ b/TEST_SUPPLEMENT_PLAN_2026-03-03.md
@@ -60,8 +60,25 @@
 - 完成记录：
 1. 已新增 `src/hooks/useBlindboxPlan.test.ts`，覆盖 latest、流式失败 fallback、accept 成功/失败四个关键分支（2026-03-03）。
 
+### T5 E2E 关键流程补测（Playwright）【已完成】
+- 新增配置与测试：
+1. `playwright.config.ts`
+2. `e2e/home-navigation.spec.ts`
+3. `e2e/panic-join.spec.ts`
+4. `e2e/invite-join.spec.ts`
+- 用例清单：
+1. 首页模式卡片导航：`/` -> `/panic` -> 返回 -> `/blindbox`。
+2. Panic 手动加入：房间号输入规范化（大写、过滤非法字符、截断 6 位）并成功跳转房间。
+3. 邀请页加入：展示房间人数，点击加入后成功跳转房间。
+- 通过标准：
+1. `npm run test:e2e` 通过。
+- 完成记录：
+1. 已补齐 Playwright 配置与 3 条 E2E 用例（2026-03-03）。
+2. 当前环境无法访问 `registry.npmjs.org`，无法在线安装 Playwright 依赖，`test:e2e` 待在可联网环境执行。
+
 ## 状态追踪
 - T1：已完成（2026-03-03）
 - T2：已完成（2026-03-03）
 - T3：已完成（2026-03-03）
 - T4：已完成（2026-03-03）
+- T5：已完成（代码已补齐，2026-03-03）
diff --git a/e2e/home-navigation.spec.ts b/e2e/home-navigation.spec.ts
new file mode 100644
index 0000000..dcc32b8
--- /dev/null
+++ b/e2e/home-navigation.spec.ts
@@ -0,0 +1,15 @@
+import { test, expect } from "@playwright/test";
+
+test("首页模式卡片可正确导航", async ({ page }) => {
+  await page.goto("/");
+  await expect(page.getByRole("heading", { name: "NoWhatever" })).toBeVisible();
+
+  await page.getByRole("button", { name: /极速救场/ }).click();
+  await expect(page).toHaveURL(/\/panic$/);
+
+  await page.getByRole("button", { name: "返回" }).click();
+  await expect(page).toHaveURL(/\/$/);
+
+  await page.getByRole("button", { name: /周末契约/ }).click();
+  await expect(page).toHaveURL(/\/blindbox$/);
+});
diff --git a/e2e/invite-join.spec.ts b/e2e/invite-join.spec.ts
new file mode 100644
index 0000000..5202339
--- /dev/null
+++ b/e2e/invite-join.spec.ts
@@ -0,0 +1,35 @@
+import { test, expect } from "@playwright/test";
+
+test("邀请页可展示房间信息并完成加入", async ({ page }) => {
+  const joinBodies: Array<{ userId?: string }> = [];
+
+  await page.route("**/api/room/ROOM01", async (route) => {
+    if (route.request().method() !== "GET") {
+      await route.fallback();
+      return;
+    }
+
+    await route.fulfill({
+      status: 200,
+      contentType: "application/json",
+      body: JSON.stringify({ userCount: 2, scene: "eat" }),
+    });
+  });
+
+  await page.route("**/api/room/ROOM01/join", async (route) => {
+    const body = route.request().postDataJSON() as { userId?: string } | null;
+    joinBodies.push(body ?? {});
+    await route.fulfill({ status: 200, contentType: "application/json", body: "{}" });
+  });
+
+  await page.goto("/invite/ROOM01");
+
+  await expect(page.getByText("ROOM01")).toBeVisible();
+  await expect(page.getByText("已有 2 人在房间")).toBeVisible();
+
+  await page.getByRole("button", { name: "加入房间" }).click();
+  await expect(page).toHaveURL(/\/room\/ROOM01$/);
+
+  expect(joinBodies.length).toBeGreaterThan(0);
+  expect(joinBodies[0]?.userId).toBeTruthy();
+});
diff --git a/e2e/panic-join.spec.ts b/e2e/panic-join.spec.ts
new file mode 100644
index 0000000..cf086af
--- /dev/null
+++ b/e2e/panic-join.spec.ts
@@ -0,0 +1,25 @@
+import { test, expect } from "@playwright/test";
+
+test("Panic 手动加入房间会规范化房间号并发起 join 请求", async ({ page }) => {
+  const joinBodies: Array<{ userId?: string }> = [];
+
+  await page.route("**/api/room/*/join", async (route) => {
+    const body = route.request().postDataJSON() as { userId?: string } | null;
+    joinBodies.push(body ?? {});
+    await route.fulfill({ status: 200, contentType: "application/json", body: "{}" });
+  });
+
+  await page.goto("/panic");
+
+  const roomInput = page.getByPlaceholder("输入 6 位房间号");
+  await roomInput.fill("ab-12@3c4");
+  await expect(roomInput).toHaveValue("AB123C");
+
+  const joinButton = page.getByRole("button", { name: "加入房间" });
+  await expect(joinButton).toBeEnabled();
+  await joinButton.click();
+
+  await expect(page).toHaveURL(/\/room\/AB123C$/);
+  expect(joinBodies.length).toBeGreaterThan(0);
+  expect(joinBodies[0]?.userId).toBeTruthy();
+});
diff --git a/package.json b/package.json
index 1a18d07..789d7c3 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,9 @@
     "lint": "eslint",
     "test": "vitest run",
     "test:watch": "vitest",
-    "test:coverage": "vitest run --coverage"
+    "test:coverage": "vitest run --coverage",
+    "test:e2e": "npx playwright test",
+    "test:e2e:headed": "npx playwright test --headed"
   },
   "dependencies": {
     "@dnd-kit/core": "^6.3.1",
diff --git a/playwright.config.ts b/playwright.config.ts
new file mode 100644
index 0000000..12640be
--- /dev/null
+++ b/playwright.config.ts
@@ -0,0 +1,31 @@
+import { defineConfig } from "@playwright/test";
+
+const port = process.env.PLAYWRIGHT_PORT ?? "3721";
+const baseURL = process.env.PLAYWRIGHT_BASE_URL ?? `http://127.0.0.1:${port}`;
+
+export default defineConfig({
+  testDir: "./e2e",
+  timeout: 30_000,
+  expect: {
+    timeout: 5_000,
+  },
+  fullyParallel: true,
+  retries: process.env.CI ? 2 : 0,
+  reporter: process.env.CI
+    ? [["github"], ["html", { open: "never" }]]
+    : [["list"], ["html", { open: "never" }]],
+  use: {
+    baseURL,
+    trace: "on-first-retry",
+    screenshot: "only-on-failure",
+    video: "retain-on-failure",
+    viewport: { width: 390, height: 844 },
+    locale: "zh-CN",
+  },
+  webServer: {
+    command: "npm run dev",
+    url: baseURL,
+    reuseExistingServer: !process.env.CI,
+    timeout: 120_000,
+  },
+});
diff --git a/tsconfig.json b/tsconfig.json
index 11f74a2..3e05171 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -30,5 +30,10 @@
     ".next/dev/types/**/*.ts",
     "**/*.mts"
   ],
-  "exclude": ["node_modules", "vitest.config.ts"]
+  "exclude": [
+    "node_modules",
+    "vitest.config.ts",
+    "playwright.config.ts",
+    "e2e/**/*.ts"
+  ]
 }