Wii online: FoolYoo
FoolYoo is a small but very sweet flash game that works perfectly with the Wii remote. The game is entirely in Japanese, but it's simple enough to understand without reading the instructions. Monsters are attacking your village and as a skilled samurai you must defend it by swiping the mouse/Wii remote to cut with your katana. Chop up the enemies and watch them fall apart before your eyes. In-between rounds you get to cut vegetables based on your sensei's instructions. There you'll need to recognize a few kanji characters, though it's so easy this chart will be all the help you need.
Source: JIG Casual Gameplay