We just finished the newest Mario offering on the Wii in cooperative mode. You can now have up to four mario (and friends) running, jumping, and falling down pits on screen at the same time — a great addition to the game. You can (and inevitably do) run into and jump off of each other a lot, so it takes a lot of coordination to just play at an adequate level and pass some of the puzzles (read: this can be very frustrating at times, but also for some reason very funny too).
Overall: satisfying. We did complete it in under a week, but the only thing I’d have to say is ‘not enough Yoshi’
Up next: Free for all mode, where we will intentionally try to run into, jump off of, and push the other guy into the pit!