3SUDOKU gives you 3 different number puzzles.

1) Sudoku,
2) Sudoku Monster, and
3) Challenger.

Sudoku is a number puzzle which gives you 9-by-9 squares in which a number 1 through 9 is filled in each square. The rule of the game is to fill in the squares so that each row, column, and 3-by-3 box contain the numbers 1 through 9. This game gives you 5 different challenging levels .

Sudoku Monster is a number puzzle which gives you 16-by-16 squares in which a number 0 through 9 or a letter A through F is filled in each square. The rule of the game is to fill every row, column, and 4-by-4 box must contain 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F. This game gives you 3 different challenging levels.

Challenger is a number puzzle which gives you 4-by-4 squares in which a number 1 through 9 is filled in each square.

http://appshopper.com/education/3sudoku