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Sudoku

Fill every row, column and 3×3 box with 1–9 — or switch the symbols to letters A–I. Four difficulty levels, every puzzle has exactly one solution, with hints and notes.

How to play: tap a cell, then tap a symbol — numbers 1–9 or letters A–I, switchable above the pad. On desktop the keyboard works too (1–9 or A–I to fill, Backspace to erase, N for notes). Every row, column and 3×3 box must contain each symbol exactly once. ✏️ Notes marks small candidates; 💡 Hint fills the selected cell with the correct symbol.