Does anybody have any ideas for a simple easy to make game. I need a program for my students at school and I'm not sure what to do.

It needs to illustrate the basics of VB and also show them how to:
A. Use things like timers and key events.
B. Make their own programs.
and
C. Personalise their own programs.

I welcome all ideas with thanks. I also believe that there is no such thing as a bad idea.