Here's a collection of ten "virtual manipulatives" -- innovative minigames that are easy to learn and full of responsive play opportunities that encourage discovery of some key number and logic concepts. Rather than being told what a triangle is, you get to sketch one; and later, pop it to make room for more shapes. There are several color-related activities, including one where you can discover how red and blue equals purple, and another where you spin a color wheel into motion to mix colors. Because the multi-touch features are enabled, more than one child can play at the same time. Even though this is a free app, we don't like the links to additional apps in iTunes in the main menu. Also bad: the sugary-sweet English narration; but neither are fatal flaws. The innovative design merits a download. See the preview video at http://youtu.be/mdissKySfIw.