Brick breaker game tutorial:http://www.mrsunstudios.com/2008/07/tutorial-create-a-brick-breaker-game-in-as3/
It’s a really bad one because you end up with errors.

For the tetris game, I can’t find the one I used, but I found another one which seems also very good and guide you step by step, and this one, unlike mine, doesn’t use an external as3 file. So I think it’s easier.

http://www.webdesign.org/web/flash-&-swish/flash-tutorials/tetris.11081.html

Good luck and have a great summer!