Games similar to Hard Sudoku include LibreSudoku, which is free and open source. Other options are Sudoku Challenge. Between them they cover the web and Android.
Open-source Sudoku app designed for customization and ease of use with 6x6, 9x9, and 12x12 boards, four difficulties, extensive stats, history, and the ability to create, import, and save puzzles.
Sudoku Challenge is a free competitive Sudoku platform that goes beyond traditional puzzle play. Features include real-time multiplayer tournaments with live leaderboards and spectator mode, 1v1 duels with Elo-based matchmaking, three daily challenge puzzles with streak...
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