Here’s a great game that can teach you how to think fast.
Hundreds is basically a puzzle game in which the objective in each level is to tap the numbers in the circles and make sure that the sum of all the numbers you’ve tapped is 100. Here’s the catch: once you’ve tapped a circle, it turns red. If red circles collide, then it’s game over for you.
The game contains 100 levels—each of which consists of a unique puzzle to solve. Higher levels contain a variety of obstacles, such as spinning blades and circles with negative numbers.
The app normally costs USD $4.99, but is on sale in iTunes until January 10 in the U.S. for only USD $2.99. Although it is optimized for the iPhone 5, Hundreds is compatible with any Apple gadget that uses iOS 5.0 or later.
Check out the promotional site here.