This app was removed from the App Store.
Mac OS Education
Ribbit is a fun little game that teaches kids to recognize shapes. Rectangles, triangles and circles need to be dragged onto the board; gradually revealing the colorful picture underneath.
Applause welcomes a job well done if the complete board is cleared and a slide show of attractive animal pictures forms further reward.
This Mac OS X app is completely free. Of course it's more fun to play on an iPhone or iPad where Ribbit is available as well.