Extension 3:

When finished, add another level to your game: when the sprite reaches the other sprite, it will display "Level 2" (You can do this through a new background. Then display a different maze, one's that's more difficult than the first one and program it the same way as the first one.

Extension 4 (revised):

When the sprite touches the wall, the sprite will, instead returning to the initial position, back up 10 steps (or whatever number of steps it would go forward).

Extension 5 (revised):

Add the two player capability to your maze. Use another sprite for the second player; also use another set of keys (not the arrows) for the movement of this sprite. Make sure the sprites say hello to each other when they meet in the maze. Whichever sprite comes to rescue the friend first, wins.

Exercise 2:

Read pp. 31-34 of "Starting from Scratch" and fix the mistakes the programmer has made. (We will do this activity together)

Exercise 3:

Create another maze, similar to the first one. When the sprite touches the wall, play a sound effect and flash the screen (by changing the scene background back and forth).

Exercise 4:

Introduce "tokens" to collect in your maze. Every time it "collects" a token, it makes it disappear and increases the score by one. When the hero hits the wall, decrease the score by 1.

Exercise 5:

Create a little quiz game, where the sprite will ask you 3 questions about himself. When you answer the question correctly, then say "Good!" and increase the score by 1. Otherwise, just say "No!".

This should get you started (it doesn't, though, keep track of the score):

Exercise 6 - Pacman:

We will improve on our maze and turn in into a Pacman game.

1. Search the Scratch gallery for "Pacman" and check out the different implementations of the perennial classic {here's a good example}.

2. Start working on your own Pacman game - you will need the game backdrop - you can either draw your own or use an existing one {you will have to either draw your own maze, the main character or the tokens by yourself using the built-in Scratch vector editor};

3. Create the Pacman character - you can either draw your own or use an existing one - there should be two costumes for Pacman - open and closed mouth.

4. Add the movement functionality to Pacman (with the use of arrows).

5. Add wall collision detection (like you did in one of the extensions in the previous unit - when it senses the wall, it will back up a couple steps).

6. Create a score variable and set it to zero to begin with.

7. Create a token that will be collected by Pacman when it touches it (i.e. the token will disappear). This will increase the score by one.

8. Duplicate the token and position the duplicates in the various parts of the maze.

9. Create a variable that will hold the lives of Pacman. Set it to 4 initially.

10. Create an enemy that will be running back and forth across the maze. If it touches Pacman, he will lose a life. After he lost all lives, display "You're dead!" and end the game.

11. Display the "You got them all!" message after Pacman has eaten all the tokens and end the game. The easiest way to find out how many tokens Pacman has eaten is to use the score variable.

If you want to create your tokens in a more sophisticated way, you will want to use the so called cloning: