This is the ambitious premise of Scribblenauts, a Nintendo DS game developed by 5th Cell and published by WB Games. Scribblenauts is absolutely not an adventure game. It's not even really a puzzle game. In fact, its developers classify it as an "emergent" game-one with gameplay so different from anything else out there, it doesn't fit into a preexisting category. And they're right. Scribblenauts is entirely unique.