A great way to play Tetris, I picked this up recently and doing a marathon or two is a great way to bide time before a class or whatever, and there's plenty of sidemodes to enjoy.
It's Tetris. Controls well, and you have your Mii doing a funny dance on the bottom screen, its quite enjoyable. Sidemodes are cool but I am basic and enjoy the pleasure of just stacking for a while and making tetrises. Pretty solid, especially as a digital version!