Try it

http://scratch.mit.edu/projects/23530023/

The three puzzles I put in this project were; when you press B the sprite gets bigger and when you press S the sprite gets smaller, when the sprite touches something blue, it plays a high note and when it touches something red it plays a low note and when you move the mouse pointer the sprite follows but never touches.  When working on these, I found it really important to use the sensing blocks.  These triggered the action whenever it needed to happen.  These can be really helpful for my game since I can use sensing blocks if I want to win or lose.  The one with the sounds when I touch a color can be really helpful for the game.