Minigame madness!
The E3 version of Hamtaro: Rainbow Rescue features a large selection of minigames. The final version is supposed to have over 100. This is a drastic change from the previous Hamtaro games. It's a welcome change, too, since there were generally very few minigames in the previous Hamtaro games.
Of the minigames I played, most are fairly easy. There are a couple of tough ones, though. There is a minigame featuring Dexter on a swing, and the objective is to swing back and forth to build momentum, and then jump off at a precise time. That one took me a few tries to complete. There is also a ring-toss game featuring Pashmina, and a hat-catching game featuring Cappy. Most of the minigames are pretty short and simple, but over 100 should add up to a pretty good game.