Recommended games:
Sinister Sudoku
Sudoku learns some new tricks in this challenging puzzler - a constantly shifting grid makes every move matter.
Daily Squares
Daily Squares is a daily puzzle game. The object is to arrange all of the active blocks such that all of the rows, columns, and diagonals all add up to 34.
The games is based on the basic concept of magic squares. In this case, it is a 4x4 magic square. If you are familiar with the game Sudoku, then you may find it interesting that Sudoku is based on magic squares.
A game from mathtricks.org.
Kakuro
Entertaining game similar to sudoku that is to complete the boxes with a number between 1 and 9. Each row or column must add the value indicated, and no number can be repeated in an amount