diff --git a/.eslintrc.js b/.eslintrc.js
index 7410a96..0d2e94d 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -28,5 +28,6 @@ module.exports = {
     'no-plusplus': 'off',
     'prettier/prettier': ['error', { endOfLine: 'auto', semi: false }],
     'import/prefer-default-export': 'off',
+    'no-restricted-syntax': ['off', 'ForOfStatement'],
   },
 }
diff --git a/packages/models/quest.js b/packages/models/quest.js
index 4c500bd..efdd130 100644
--- a/packages/models/quest.js
+++ b/packages/models/quest.js
@@ -35,6 +35,26 @@ conditionSchema.add({
   not: conditionSchema,
 })
 
+const exceptionSchema = new Schema({
+  condition: {
+    type: conditionSchema,
+    required: false,
+  },
+  catchAll: {
+    type: Boolean,
+    required: true,
+    default: false,
+  },
+  responses: {
+    type: [responseSchema],
+    required: true,
+  },
+  hints: {
+    type: [String],
+    required: true,
+  },
+})
+
 const stageSchema = new Schema({
   id: {
     type: String,
@@ -66,6 +86,10 @@ const stageSchema = new Schema({
     type: [String],
     required: true,
   },
+  exceptions: {
+    type: [exceptionSchema],
+    required: true,
+  },
 })
 
 const Quest = model(
diff --git a/quests/copy/Dockerfile b/quests/copy/Dockerfile
new file mode 100644
index 0000000..2a8e341
--- /dev/null
+++ b/quests/copy/Dockerfile
@@ -0,0 +1,3 @@
+FROM linuxodyssey/quest-base
+
+COPY home ${HOME}
\ No newline at end of file
diff --git a/quests/copy/game.yml b/quests/copy/game.yml
index 923f03f..d7039c5 100644
--- a/quests/copy/game.yml
+++ b/quests/copy/game.yml
@@ -1,6 +1,27 @@
 title: 複製檔案
 instruction: |
-  複製檔案
+  在這個關卡中，你將學習如何複製檔案。
 
 requirements:
   - create
+
+stages:
+  - id: start
+    task: 輸入 `echo start` 來開始
+    condition:
+      output:
+        - start
+    exceptions:
+      - condition:
+          command:
+            - ^echo$
+        responses:
+          - type: narrative
+            content:
+              - 你忘記輸入 `start` 了嗎？
+              - 請輸入 `echo start` 來開始
+      - catchAll: true
+        responses:
+          - type: narrative
+            content:
+              - 請輸入 `echo start` 來開始
diff --git a/server/src/game/commandHandler.js b/server/src/game/commandHandler.js
index d03f6f1..26f4526 100644
--- a/server/src/game/commandHandler.js
+++ b/server/src/game/commandHandler.js
@@ -97,6 +97,19 @@ export default class CommandHandler extends SessionHandler {
     return matches.some((m) => m === true)
   }
 
+  async checkException(stage) {
+    const exceptions = stage.exceptions || []
+    for (const exception of exceptions) {
+      console.log(exception)
+      // eslint-disable-next-line no-await-in-loop
+      if (exception.condition && (await this.isMatch(exception.condition))) {
+        return exception
+      }
+      if (exception.catchAll) return exception
+    }
+    return null
+  }
+
   async run() {
     this.quest = await Quest.findById(this.session.quest)
     const stages = this.getStages()
@@ -114,6 +127,14 @@ export default class CommandHandler extends SessionHandler {
 
     const stage = stages.find((_, i) => matches[i])
     if (!stage) {
+      for (const s of stages) {
+        // eslint-disable-next-line no-await-in-loop
+        const exception = await this.checkException(s)
+        if (exception) {
+          console.log('Got exception', exception)
+          return this.executeException(exception)
+        }
+      }
       return {}
     }
     const response = this.execute(stage)
diff --git a/server/src/game/sessionHandler.js b/server/src/game/sessionHandler.js
index 0688041..2312c4c 100644
--- a/server/src/game/sessionHandler.js
+++ b/server/src/game/sessionHandler.js
@@ -63,4 +63,19 @@ export default class SessionHandler {
       },
     }
   }
+
+  executeException(exception) {
+    const { hints, responses } = exception
+    if (hints && hints.length > 0) this.session.hints.push(hints)
+
+    return {
+      responses,
+      hints,
+      callback: () => {
+        if (hints && hints.length > 0)
+          pushToSession(this.session.id, 'hints', hints)
+        pushToSession(this.session.id, 'status', this.session.status)
+      },
+    }
+  }
 }