On each planet there are waiting for Robbo many of items: - magneses - guns, lasers, blasters - aliens, birds - bombs - doors opened by keys etc. etc. Planets are divided on two difficulty levels: high and low. Each of 50 low-difficulty planet takes about 3-15 minutes. Low-difficulty planets are good for childrens. Each of 50 high difficulty (for experienced) planet takes about 15-60 minutes. High-difficulty planets are dedicated for experienced players. Platforms: Robbo has been precisely tested on Sony Ericsson K500i and K700. Propably it will work also on newer wersions of Sony Ericsson. It work good in emulator of rest of SE phones (K300, K750, P900, etc.). But, because i haven't real devices, i'm not sure rest of them. Device must be compatible with MIDP 2.0.