世界上最難的數獨遊戲,這是一個2×2,你能解決嗎?
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.