But Monkey Ball does have 50 multiplayer mini games, which are all enjoyable to varying extents, depending on who you are. The majority are 4 player, but some (~5) are two player, and some don't use the nunchuk, so if you're strapped for cash and only have the wiimote, you're not all lost. It also has a single-player game (also using just the wiimote) which has the potential to make a grown man cry with its insanely difficult later levels, and will definitely level up your fine motor control ability. But in a good way, because you know they are able to be beaten and that they've been playtested to death to be sure that there's guaranteed to be a sliver of hope, no matter how small, that you can indeed beat the level. There are even two hidden worlds of 8 levels each that can be unlocked only after beating each world with no continues.
I vote Monkey Ball. I got Zelda and Monkey Ball and they've served me well.