Key Features Rubik Square Puzzle Wooden square number puzzle Three levels of difficulty Make all rows, columns and diagonals add up Extra tiles for more difficulty , Rubik Square Puzzle by Lagoon. This wooden square number puzzle with three levels of difficulty is the perfect new addiction for you if you love Sudoku! Players need to make all rows, columns and diagonals add up to the same number. You can add in the extra red and orange tiles to make it more challenging! We love numbers!