NineGaps is a highly addictive tricky puzzle game.

The goal of the game is really simple. You have to use your wits to place numbers from 1 to 9 in the missing gaps, while matching the operations presented in the puzzle. It's just like sudoku, but different!

 User's Comments:

"Brain twister

This game reminds me of Sudoku. It's different enough to keep you coming back and you can get thru a game alot quicker then Sudoku. So is perfect for those subway rides to work. Definitely pick this up."

"Math brain twister

Very simple concept but chalenging to figure out the board- I love sudoku and brain age. It's a fun mix! Sending it ot my brainiac friends for their commutes."