世界の難しい数独、それは2×2。あなたはそれを解決することはできますか?
The World's Hardest Sudoku and it's a 2 x 2. Can you solve it? It will only take you a few seconds to find out. To solve a SUDOKUit you need forward thinking skill like you use in Sudoku and chess but you will have to dig much deeper. Beat our 6th level and you will trash our claim.