I'm in the process of collecting cartridges of all the original launch titles for the Game Boy (both Japanese and North American). So far, Yakuman is pretty fun (see my mahjong page for a bit more on that) and Baseball is annoying yet somehow compelling, but Super Mario Land is the first one that I've really enjoyed. It's short (only four worlds with three levels each) and weird (aliens and ninjas?!), and Mario's momentum feels a little strange. Still, it feels enough like a Mario game to be recognizable, but it does some things—successfully, I'd say—that no other Mario game I've played has done. I really enjoyed the regular Mario stuff and the shmup levels (I want more Mario shmup!). I finished the game satisfied and still wanting more. I'll be playing it again. I recommend it.