Sudoku banzai is a free online Sudoku game with 4x4, 9x9 and 16x16 grids with a single solution. You can play for free 1 grid per day without registering. Sudoku is derived from the Latin square and the problem of the 36 officers of the Swiss mathematician Leonhard Euler. The goal is to fill the grid with a series of numbers all different, that are never more than once on the same line or or in the same column, , or in the same sub grid.