Advance 1 was my favorite GBA game. I have played the first level literally hundreds of times. I think the physics are fine, the music is good, and the special stages were alright, too. Advance 2, on the other hand, was not so good. My friend owned it, and I played it quite a lot. I absolutely loved the music, but the level design and bottomless pits etc. were horrible. His copy was 100% complete, though, so I got to play through the Super Sonic fight without having to go through the whole process. Advance 3, I played in an emulator rather than on real hardware. I think it's a good combination of the two. Better physics than SADV2, but that isn't saying much. The team concept turned out alright, though maybe it could have been done better.