FreeNumberJump app for iPhone and iPad
This is game played easily between the students.
All you have to do is just fill the cells from 1 t0 100 according to the rules.
The rules are easy, if you want to move up,dows,left or right, you have to skip 2 cells, and for moving you have to skip just 1 cell.
the game has 2 alternatives included, a timeless version and a 1,5 minutes version.
The pro version has an option to write yor own name and free bonus time
just create you strategy to fill up to 100, enjoy the game