Some cool free apps that you can download are Air Video Free, iHandy Level Free, Cut the Rope: Experiments, Hide the Fart, I'd Cap That, Men in Black 3, Swamp People and Pic Collage+. Other apps include Line Runner, Draw Something Free, Gears, Pic Stitch, Rage of Bahamut and Jetpack Joyride.
Subway surfer is the best one. Then you can prefer angry birds, temple run, temple run 2, facebook, whats app messenger, bouncing mouse and others. There are thousands of free apps available in the android market. These are more in demand and also the best which are mostly preferred by the users.
Type this 4 pics 1 word Temple Run 2 Subway Surfers Tiny wings The first 2 are challenging games, and the last one is a book app its free and it is really amazing. The second to last one is 99 cents I think.