I agree, Wario Land 2 is probably the best one, even though they're all great. I enjoy the Wario titles more than most regular Mario games, really. This may be my second favorite Game Boy game (first is Link's Awakening)
Not being able to die was brilliant, and having to figure out when and where to get hit by particular enemies gave the game some clever puzzle elements. I also loved the branching pathways. PROTIP: At the beginning part of the first stage, DON'T get out of bed when you hear the alarm clock. I found that path out by accident!
Plus, the game has Captain Syrup and she's awesome. Nintendo should use her more.


