diff --git a/src/app.js b/src/app.js
index c2d5a1a..8101014 100644
--- a/src/app.js
+++ b/src/app.js
@@ -10,6 +10,8 @@ class GameScene extends Phaser.Scene {
       frameHeight: 20,
     });
 
+    // TODO 1: load the tileset and tilemap with keys of "tileset" and "map" respectively.
+
     this.load.image("wallHorizontal", "assets/wallHorizontal.png");
     this.load.image("wallVertical", "assets/wallVertical.png");
 
@@ -53,7 +55,8 @@ class GameScene extends Phaser.Scene {
     // Make the player collide with walls
     this.physics.add.collider(this.player, this.walls);
 
-    this.coin = this.physics.add.sprite(60, 130, "coin");
+    this.coin = this.physics.add.sprite(0, 0, "coin");
+    this.moveCoin();
 
     // Display the score
     this.scoreLabel = this.add.text(30, 25, "score: 0", {
@@ -81,14 +84,19 @@ class GameScene extends Phaser.Scene {
     this.jumpSound = this.sound.add("jump");
     this.coinSound = this.sound.add("coin");
     this.deadSound = this.sound.add("dead");
+
+    // TODO 4.2: Add emitter for particle system.
   }
 
   /**
    * Creates the walls of the game
    */
   createWalls() {
+    // TODO 2.1: comment out manual wall creation
     this.walls = this.physics.add.staticGroup();
 
+    // TODO 4.1: import pixel as "pixel" from "assets/pixel.png"
+
     this.walls.create(10, 170, "wallVertical"); // Left
     this.walls.create(490, 170, "wallVertical"); // Right
 
@@ -101,6 +109,16 @@ class GameScene extends Phaser.Scene {
     this.walls.create(500, 170, "wallHorizontal"); // Middle right
     this.walls.create(250, 90, "wallHorizontal"); // Middle top
     this.walls.create(250, 250, "wallHorizontal"); // Middle bottom
+
+    // TODO 2.2: create a tilemap called map with this.add.tilemap()
+    // the first parameter is the name of the tilemap in preload()
+
+    // TODO 2.3: add the tileset to the tilemap with map.addTilesetImage(tilesetName, key)
+    // the first parameter is the name of the tileset in Tiled
+    // the second parameter is the name of the tileset in preload()
+
+    // TODO 2.4: Enable collisions for the first tile (the blue walls) with the setCollision() method
+
   }
 
   /**
@@ -110,6 +128,9 @@ class GameScene extends Phaser.Scene {
    * check for win conditions, etc.
    */
   update() {
+
+    // TODO 5.1: 
+
     this.movePlayer();
     this.checkCoinCollisions();
 
@@ -211,10 +232,10 @@ class GameScene extends Phaser.Scene {
     // bounce back in the opposite direction without losing speed
     enemy.body.bounce.x = 1;
 
-    // destroy the enemy after 10 seconds
+    // destroy the enemy after 15 seconds
     // this is roughly how long it takes to fall through the hole
     this.time.addEvent({
-      delay: 10000,
+      delay: 15000,
       callback: () => enemy.destroy(),
     });
   }
@@ -223,12 +244,17 @@ class GameScene extends Phaser.Scene {
    * Called when the player dies. Restart the game
    */
   handlePlayerDeath() {
+    // TODO 5.1: EXPLODE!!
     this.scene.restart();
     this.deadSound.play();
+
+    // TODO 5.2: Instead of immediately restarting the game, add a delay
+    // Hint: see addEnemy()
+
   }
 }
 
-
+// TODO 3.1: Update the map config so that the width is 800 and the height is 560 
 const config = {
   type: Phaser.AUTO,
   width: 500,