Sudoku Challenge Online offers hours of entertainment for beginners and expert Sudoku fans alike. Challenge yourself and improve your puzzle skills. Look carefully at the numbers that have already been filled in. These will give you the clues you need to find the right cells for the remaining numbers. If you’ve never played Sudoku before, you can complete a tutorial to become more familiar with the rules of the game. If you’re an expert player, you can dive right in with the toughest puzzle setting. The hardest puzzles will have fewer prefilled numbers and a strict time limit. If you get stuck, you can purchase boosters from the shop to help you along. To collect shop coins, you can spin the wheel of fortune and complete various achievements.