The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
The game is about sorting numbers in cells from 1 to 15 in ascending order starting from number 1 in the top left corner. There is a blank cell where you can move a number in from any adjacent cell. Once moved it leaves a blank cell behind. You have to take advantage of the blank cell in order to sort the numbers and solve the game.The game has two levels with best score registered for each level. The second locked level follows the same logic, but is more challenging since the numbers are from 1 to 24. It is unlocked after the completion of the first level.i1Challenge goes on even when you solve both levels, because every time a game is launched numbers are placed into different positions.i1Challenge is completely free to play. There are optional smart movement hints that help you improve your score by placing a number in its correct position with one button click. You can purchase 8 hints for just $0.99. So go ahead and try it, exercise your brain while having fun.