數(shù)獨 すうどく(Sūdoku)

一個已解答的數(shù)獨其實是一種多了宮的限制的拉丁方陣，因為同一個數(shù)字不可能在同一行、列或宮中出現(xiàn)多于一次。 這種游戲只需要邏輯思維能力，與數(shù)字運算無關。雖然玩法簡單，但數(shù)字排列方式卻千變萬化，所以不少教育者認為數(shù)獨是鍛煉腦筋的好方法。 Sudoku is a logic-based, combinatorial number-placement 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 subgrids that compose the grid (also called "boxes", "blocks", "regions", or "subsquares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.