diff --git a/src/shattered_sword/Tools/DataTypes/MapTemplate.ts b/src/shattered_sword/Tools/DataTypes/MapTemplate.ts
index 5ba2a17..f57d5f6 100644
--- a/src/shattered_sword/Tools/DataTypes/MapTemplate.ts
+++ b/src/shattered_sword/Tools/DataTypes/MapTemplate.ts
@@ -22,6 +22,7 @@ export default class MapTemplate {
     corners?: [Corner, Corner, Corner, Corner];
     // Tile to fill all empty spaces between rooms
     background: number;
+    minroom: number;
 }
 
 export class Entrance {
diff --git a/src/shattered_sword/Tools/RandomMapGenerator.ts b/src/shattered_sword/Tools/RandomMapGenerator.ts
index fc7df86..f290a81 100644
--- a/src/shattered_sword/Tools/RandomMapGenerator.ts
+++ b/src/shattered_sword/Tools/RandomMapGenerator.ts
@@ -19,6 +19,8 @@ export default class RandomMapGenerator {
     private roomWithDownEntranceWeight: number;
     private rooms: Array<Room>
     private gen: any;
+    private hasExit: boolean;
+    private minRoom: number;
 
     constructor(JSONFilePath: string, seed: any) {
         let xhr = new XMLHttpRequest();
@@ -38,6 +40,8 @@ export default class RandomMapGenerator {
         this.rooms = new Array();
         let gen = require('random-seed');
         this.gen = new gen(seed);
+        this.hasExit = false;
+        this.minRoom = this.template.minroom;
 
 
         this.template.rooms.forEach((room) => {
@@ -81,15 +85,32 @@ export default class RandomMapGenerator {
     }
 
     getMap(): TiledTilemapData {
-        this.maxX = this.template.entrance.width - 1;
-        this.maxY = this.template.entrance.height - 1;
-
         let room = this.copyRoom(this.template.entrance, 0, 0);
-        
-        console.log(room);
+        this.rooms.push(room);
+
+
+        if (!this.hasExit) 
+            throw new Error("Fail to generate a room with exit!");
+
         return this.map;
     }
 
+    private putNextRoom(): boolean {
+
+        return true;
+    }
+
+    private isValidRoom(topLeft: Vec2, bottomRight: Vec2): boolean {
+        this.rooms.forEach((room) => {
+            if (room.topLeft.x < bottomRight.x &&
+                room.bottomRight.x > topLeft.x &&
+                room.topLeft.y < bottomRight.y &&
+                room.bottomRight.y > topLeft.y)
+                return true;
+        })
+        return false;
+    }
+
     private getEntranceFacing(entrance: Entrance, width: number): Facing {
         if (entrance.x === 0)
             return Facing.LEFT;
@@ -100,12 +121,60 @@ export default class RandomMapGenerator {
         return Facing.DOWN;
     }
 
+    private getRandomRoom(value: number, facing: Facing): RoomTemplate {
+        let array = this.getRoomArray(facing), weight = this.getRoomWeight(facing);
+
+        if (value >= weight)
+            throw new Error("Random number " + value + " is larger than total weight " + weight);
+
+        array.forEach((room) => {
+            if (value < room.weight)
+                return room;
+            value -= room.weight;
+        })
+        throw new Error("Cannot find Room! \nRooms: " + JSON.stringify(array) + "\nValue: " + value);
+    }
+
+    private getRoomArray(facing: Facing): Array<RoomTemplate> {
+        switch (facing) {
+            case Facing.LEFT:
+                return this.roomWithLeftEntrance;
+            case Facing.RIGHT:
+                return this.roomWithRightEntrance;
+            case Facing.UP:
+                return this.roomWithUpEntrance;
+            case Facing.DOWN:
+                return this.roomWithDownEntrance;
+        }
+    }
+
+    private getRoomWeight(facing: Facing): number {
+        switch (facing) {
+            case Facing.LEFT:
+                return this.roomWithLeftEntranceWeight;
+            case Facing.RIGHT:
+                return this.roomWithRightEntranceWeight;
+            case Facing.UP:
+                return this.roomWithUpEntranceWeight;
+            case Facing.DOWN:
+                return this.roomWithDownEntranceWeight;
+        }
+    }
+
     private copyRoom(old: RoomTemplate, posX: number, posY: number): Room {
         let room = new Room();
         room.topLeft = new Vec2(posX, posY);
         room.bottomRight = new Vec2(posX + old.width - 1, posY + old.height - 1);
         room.topLayer = [...old.topLayer];
         room.bottomLayer = [...old.bottomLayer];
+        if (posX < this.minX)
+            this.minX = posX;
+        if (posY < this.minY)
+            this.minY = posY;
+        if (posX + old.width - 1 > this.maxX)
+            this.maxX = posX + old.width - 1;
+        if (posY + old.height - 1 > this.maxY)
+            this.maxY = posY + old.height - 1;
         return room;
     }
 }