Uzuriel Sudoku is a flash-based version of the game of Sudoku, the classic logic numbers puzzle.
The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid contains all of the digits from 1 to 9.
Uzuriel Sudoku offers three difficulty levels (easy, normal, hard), plus a custom level that allows you to dial in your ideal layout. You can play with a (virtual) pencil or pen, and even print out puzzles. This game was created by "uzuriel".