Think of Sudoku but with numbers. Using the numbers 1 to 9, complete the number square to ensure all operations are true. Add, subtract, multiply and divide your way to top scores and bragging rights against friends who think their fancy calculus gives them an edge. With five different puzzle difficulties, this is sure to appeal to the inner-math addict in you – even if you deny having one.

Pros:
Simple interface.
Easy to place and remove incorrect number tiles.
Tutorial for newcomers.

Cons:
Would have liked Bluetooth multiplayer for head-to-head battles.
Only one skin.

Price: $0.99
Try or Buy: Buy