The last Duck Duck Moose app my kids and I tested was , which is available in separate $2 editions for the iPhone and iPad (where it goes by the moniker. It's a different beast from the first two games, with eight unique modes. The colorful cartoony fish can form letters, numbers, or shapes; they can perform the alphabet song; they can play a color-choosing game, a matching game, or a spot-the-different fish game; and finally, they can offer a generic playtime where you can guide fish around, and make them grow or shrink by tapping.

Fish School packs a lot of different kinds of fun, and Anya really gets a kick out of it. The "spot the differences" game--where you need to find the one fish of another color, or swimming in the wrong direction--and the matching game both provide a bit more mental stimulation for her. Sierra likes the game too, but gets far less out of it; she mostly likes to look at the colorful fish and swipe through the different options.

The only annoyance with Fish School is its ever-present mode-swapping button (which toggles through each gameplay option in sequence). When the girls crowd around my iPad together, it's far too easy for someone's errant fingertip to change modes accidentally, which inevitably leads to hurt feeling--or worse: Tears on your precious iOS device.

All of Duck Duck Moose's apps are kid-pleasers, including ones outside the scope of this review (like and ). The developers clearly know how to appeal to kids, and how to make games fairly kid-proof. (For example, the apps don't rotate when you turn your device, which normally I dislike, but with kids who aren't well-versed in the intricacies of the accelerometer, it's a welcome design choice.) If you can only buy one of the Duck Duck Moose apps, I think Itsy Bitsy Spider is the way to go. But the good news is, you can't go wrong with any of them. As an added bonus, my family finds that the iPhone versions of the apps all look great in "x2" mode on the iPad.