Sudoku at four levels with pencil marks, hints, undo and a timer.
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EasyMediumHardExpert
Time
0:00
Mistakes
0
Hints
0
Best
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Dealing a puzzle…
Keys: arrows move, 1–9 fill, Shift+number pencils, N notes, Backspace erases, U undoes.Tap a cell, then a number. Notes pencils small candidates instead.