This whimsical app takes fly-by-tapping to a new level. Willow the Whale must take flight to avoid an evil inky blob called Baron Von Barry. With the help of six-year-olds (and their folks, who get hooked), Willow travels along rainbows, captures colorful stars, and turns loop-de-loops in Technicolor skies. 
Best For: Elementary-schoolers 
Brain Boost: Low 
Fun Factor: ***** 
Cost: Free for Apple, $2.99 for Android 
Download On: iPhone/iPod/iPad and Android