ChuChu Rocket!

The Good
The insane simplicity combined with incredible addiction. This was actually the game that made me want a Dreamcast, along with a couple others, but mainly this.

I love the speed and mind blowing action that is taking place at almost every moment.

Very shallow learning curve. "Place arrows on the ground to direct the mice the way you want." It doesn't get much simpler than that for a game.

The Bad
Lack of a full game map maker. Sure you could make puzzles but you couldn't make any online maps (or single machine multiplayer).

Also the fact that nobody ever wants to play me at the game because I'm quite good at it.

The Bottom Line
Just play it. You'll like it.