All I've played is a bit of the first one. Some coworkers and I are going to try to do 4 player coop on it soon since we have enough gameboy advances and link cables. I feel like it'll be a fun time. I really enjoyed it the one time I got to play it with a friend before.

I also played Crystal Bearers, but that's pretty radically different.

I have no idea what the sequels were like, but I could get behind another entry.