diff --git a/packages/models/quest.js b/packages/models/quest.js
index 1eb2b94..3634183 100644
--- a/packages/models/quest.js
+++ b/packages/models/quest.js
@@ -54,7 +54,10 @@ const stageSchema = new Schema({
     required: true,
     default: false,
   },
-  condition: conditionSchema,
+  condition: {
+    type: conditionSchema,
+    required: true,
+  },
   responses: {
     type: [responseSchema],
     required: true,
@@ -68,11 +71,32 @@ const stageSchema = new Schema({
 const Quest = model(
   'Quest',
   new Schema({
-    _id: String,
-    title: String,
-    order: Number,
-    instruction: String,
-    stages: [stageSchema],
+    _id: {
+      type: String,
+      unique: true,
+      required: true,
+    },
+    title: {
+      type: String,
+      required: true,
+    },
+    requirements: {
+      type: [
+        {
+          type: String,
+          ref: 'Quest',
+        },
+      ],
+      required: true,
+    },
+    instruction: {
+      type: String,
+      required: true,
+    },
+    stages: {
+      type: [stageSchema],
+      required: true,
+    },
   })
 )
 
diff --git a/packages/models/user.js b/packages/models/user.js
index 6c3bc44..7bdb2f3 100644
--- a/packages/models/user.js
+++ b/packages/models/user.js
@@ -1,5 +1,24 @@
 import { model, Schema } from 'mongoose'
 
+const progressSchema = new Schema({
+  quest: {
+    type: String,
+    ref: 'Quest',
+  },
+  sessions: [
+    {
+      type: Schema.ObjectId,
+      ref: 'Session',
+    },
+  ],
+  completionStatus: {
+    type: String,
+    enum: ['incomplete', 'completed'],
+  },
+  startedAt: Date,
+  finishedAt: Date,
+})
+
 const User = model(
   'User',
   new Schema(
@@ -23,6 +42,7 @@ const User = model(
         id: String,
         displayName: String,
       },
+      progress: [progressSchema],
     },
     {
       timestamps: true,
diff --git a/quests/discover/game.yml b/quests/discover/game.yml
new file mode 100644
index 0000000..dbfde46
--- /dev/null
+++ b/quests/discover/game.yml
@@ -0,0 +1,6 @@
+title: Discover the World!
+instruction: |
+  試著探索這個世界吧！
+
+requirements:
+  - spell
diff --git a/quests/read/game.yml b/quests/read/game.yml
new file mode 100644
index 0000000..9940a5a
--- /dev/null
+++ b/quests/read/game.yml
@@ -0,0 +1,6 @@
+title: Read the File
+instruction: |
+  閱讀檔案
+
+requirements:
+  - spell
diff --git a/quests/spell/game.yml b/quests/spell/game.yml
index 83c0d30..e56c5f2 100644
--- a/quests/spell/game.yml
+++ b/quests/spell/game.yml
@@ -4,6 +4,10 @@ instruction: |
 
   「輸入 echo Hello World!」
 
+requirements:
+  - helloworld
+  - noexists
+
 conditions:
   pwd_home: &pwd_home
     pwd:
diff --git a/server/src/utils/quest.js b/server/src/utils/quest.js
index 61866b0..ffb4041 100644
--- a/server/src/utils/quest.js
+++ b/server/src/utils/quest.js
@@ -31,7 +31,7 @@ export default async function loadAndUpdateQuests() {
           return Quest.findByIdAndUpdate(
             id,
             {
-              id,
+              _id: id,
               ...quest,
             },
             {