The paper-based craze that has captured the minds of puzzle fans everywhere is about to become the digital craze that will capture the minds of puzzle fans who own PSPs. Ubisoft has announced that Go! Sudoku will be available for PSPs this March. Sudoku is a numbers-based game that challenges players to line up integers in a grid both horizontally and vertically so that no column or row has the same number twice. Go! Sudoku will have four difficulty levels and 1,000 puzzles set against customizable backgrounds. Ubisoft has not announced pricing information for the E-rated game.