Sudoku - it`s a popular logical game ,which is on the web side pages now. It comes from Japan and that`s logical jigsaw.
Boards of Sudoku have nine
squares 3x3 and everyone impilcates nine ranges. We write numbers : 1 to 9 in the ranges but they can`t repeat in unspired and upright and at the same squares. It`s a reason that the game Sudoku in japanise is " one number". Boards of Sudoku have many levels of dificult. It`s not a mathematics game. We must eliminate other numbers. If we find a good number it will show us way to another. This game learns us patience, concentrate and observation. We can pracitise our memory. If you play on your computer it has got advantage that you need not pencil and rubber.