Addictive learning game pits man versus machine. Who’s smarter? The unique, intuitive interface for mobile:- Tap a button to select a learning activity- Tap the left selector for index of terms- Swipe to turn the page- Tap the right selector for more apps- Tap the gallery to discover 800+ apps and 50k+ termsJoin the 5,500,000 plus who have downloaded Keys-by-TEARN.