sonic advance is the 1st time sonic ever apperead on a nintendo console ending the 10 year rivalry between the two companys. also featuring amy for the very 1st time in 2d. there were 7 levels (includeing moon zone with sonic) and 7 emeralds to collect. the fights were pretty good (below amy vs eggman at the end of neo green hill zone act 2)

levels!

level 1 neo green hill zone (acts=2)
level 2 secret base zone (acts=2)
level 3 casino paridise zone (acts=2)
level 4 ice mountain zone (acts=2)
level 5 angel island zone (acts=2)
level 6 egg rocket zone (acts=2)
level 7 moon zone (acts=2 sonic only)

the game could link up with the nintendo game cube too. and you could send or recieve chao information and send your rings collected on gba onto game cube! you could also play two mini games in the tiny chao garden includeing a card game and a rock paper siccosers game. pretty funky.