The End is an odd beast: a combination of a platformer, a puzzle boardgame, a philosophical investigation of the nature of death, and a variant Myers Brigg map.
Funded by the UK's Channel 4 and developed by Preloaded, it was conceived as a way to engage teens and get them to think about life, death, belief, and science (I kid you not). Naturally, they created a platformer. That's the cynic speaking there; we've seen way too many "serious games" or "games for change" that take a theme and bolt it onto a game style that's totally inappropriate -- like, oh, Debt Ski. Surprisingly, however, The End works, on three different levels simultaneously.