New Super Mario Bros. Wii. I like the idea of co-op with up to four people in a traditional 2-D side-scroller, but the implementation creates a lot of frustration. First of all, the game is challenging enough due to obstacles and enemies, but the extra players on the screen at the same time tend to be an annoyance instead of a help. It's like the game is designed with a single player in mind and the extra players are just thrown into the mix haphazardly. The bouncing off the heads of each other becomes quickly frustrating, and the outdated lives and continues system has no business being in the game at all. It's really too bad because I wanted to like it a lot more than I do.