Planetoid is a cool colorful arcade game where you try to demolish as many planets as you can in seven differnt modes:
In addition there are several skill levels available: Beginner, Experienced and Professional. If you want to see the rules in action - just watch the game in demo mode; this is quite a spectacular show by itself, sit back and relax. Play these games and you'll be busy for a while. In registered version: no nags, more levels, autosave and free support by email.