Any Java programmer here?
There's a Java game programming contest at Java Unlimited
The prizes aren't much but it's fun
I am developing mine but it seems to be too big to pass the size limit (4K is a real pain )
You should try it too

quangntenemy: To save a few bytes (4096 is a very low limit) I would recommend you to change your nickname to something smaller if you want it to appear in the game

==> count me out

4k is a lot of bytes though.
you don't need any graphics ... there are plenty of algo's that generate nice looking textures and backdrops, in a for loop or two
and if all else fails:
PC>gues what number i'm thinking of?
You>555
PC>to high
...