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Sudoku Classroom | Free Online Sudoku with Five Difficulty Levels
數獨小學堂｜免費線上數獨・五種難度
About This Game
Sudoku, five difficulty levels and a promise that every puzzle has exactly one solution. Sudoku Classroom is a free browser sudoku that starts you on easier grids and lets you climb as far as you like. Jot candidate numbers into the notes, ask for a hint when a row refuses to cooperate, and let the game remember your progress so you can close the tab and come back later. You can also open a room so friends can watch and comment while you reason through the grid. It plays on phones and tablets too, with nothing to download.
