I 2nd New Super Mario Bros. Wii. Also, Lego Star Wars is great (and only $20!). Both of those games are fun and not too difficult, and yet another player can drop in to help and then drop out without interrupting the flow of the game. (And don't worry that Lego Star Wars is too violent, because it's not. Now Lego Batman is on the "dark" side. I'm not sure about Lego Indiana Jones because I haven't played it enough.)