hello guys! my brother and i did talk about good gameboy games lately and ended up in agreeing that TMNT: Radical Rescue is the best we've ever played.
i don't know if it was a famous game thats why i opened up this thread, because if you haven't played it, it is worth checking it out.
You started as Michelangelo and had to rescue all the other turtles, splinter and april o'neil. it probably will remind you of an mix of megaman and metroid except you won't get any new items but instead you get new characters.
if you fight a boss and end up deafting him you will eventually rescue one of the turtles, wich allows you to switch between your new char and the old one.
each turtle comes along with a special attack (michaelangelo is able to glide with his stick, raffael could crawl through narrow paths and so on) wich mostly allows you to explore new areas. the graphics and the music where cool too, especially the bosses i recall were animated very well for a gameboy game.
i liked this game very much although i was never able to finish it for reasons i can't remember right now.

i think it really was outstanding and i played it more often then Turtles in Time although that the common sense is that turtles in time is the best turtles game so far. maybe it wasn't that good, i wasn't even 10 years old when i played it, maybe i was just to easely impressed....