Cube.

Here is a pretty cool logic game. It starts off really easy, but soon it'll make you think outside the cube a bit. Basic idea is to join the colours by clicking on the base ones then creating a path between them. Black squares are a no-go.

Have fun.
God bless.
Sari.

Edit: I'm currently stuck at around level 16. I'm not sure exactly what level 'cause the game doesn't actually show the level number you're on. I quit a couple of times and played up to it again, counting the second time, and I'm not sure I didn't quite lose track of the level number, though. But it's near 16.