The best alternatives to Tictoku are Word Square, Sudoku Round, and Pro:Sudoku. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Tictoku?
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Sudoku Round is a minimalistic take on a classic game. I wanted to bring the experience of playing sudoku on paper with just a pen - no distractions that could break your flow and focus. The board and numbers - that’s all that counts here!
Pro:Sudoku brings the delightful experience of playing Sudoku with a pencil on paper to your iPad. Pro:Sudoku uses handwriting recognition to recognize the numbers you insert, and allows you to write in and clear notes as well as numbers, just like on paper.
UsDoku.com is a real-time multiplayer Sudoku game where you battle your friends to see who can complete the puzzle the fastest. Blocks change their color to the player who gets them right first. Correct answers score points, mistakes cost them.