Decoded
Grid solved.
Fill every row, column, and 3×3 box with 1–9. Every Cipher Grid puzzle is machine-verified to have exactly one solution. Desktop: click a cell, type 1–9, arrows to move, P pencil, H hint, Backspace erase. Touch: tap a cell, then the pad.
How to play Cipher Grid
Fill every row, every column, and every 3×3 box with the digits 1 to 9, no repeats. On desktop, click a cell and type a number, move with the arrow keys, toggle pencil marks with P, and ask for a hint with H. On touch, tap a cell then tap the pad.
Every Cipher Grid puzzle is machine-verified to have exactly one solution, so you never have to guess — every step is deductible. Three difficulties change how many clues you start with. Fill the grid correctly to solve it.
Tips & strategy
- Pencil the candidates into a box, then eliminate — the answer often falls out of a single row or column.
- Scan for cells with only one possible digit before reaching for a hint.
- The unique-solution guarantee means a contradiction is always your own error, never the puzzle's.
- Harder boards start with fewer clues; expect to lean on pencil marks throughout.
Cipher Grid is free Sudoku online with no guessing and no download — solver-certified unique puzzles across three difficulties, playable right in your browser.