We had a chance to play 5 of the 16 levels for Electronic Arts' upcoming title The Simpsons. A lot of work is being put in to keep the game satirical of the video games, and so far they're on the right track.
The first level we tried was "Shadow of the Colossal Donut," and unsurprisingly it had us facing off against a giant, robotic beast. (We are disappointed, however, that said beast was not large enough that we climb on top of him like in Shadow of the Colossus.). Each of the characters' special moves are fairly unique and integral to solving the levels. Bart, for a rather lame example, is the only one that can climb ropes, while Marge has a loudspeaker used to attract people for her Pikmin-esque mob.
Much like LEGO Star Wars, the game features drop-in / drop-out co-op. Because of the unique abilities of each character, you will have to switch between each to solve puzzles. The town of Springfield acts a central hub where you can access all the levels.