Cozy Sudoku Frogame Original

About Cozy Sudoku

Cozy Sudoku is a Frogame Original take on the classic number puzzle: a 9×9 grid, the digits one to nine, and the rule everyone knows — no repeats in any row, column or box.

What separates a good sudoku app from a frustrating one is puzzle quality, so every board here is machine-generated and then verified by a solver to have exactly one solution. That means no guessing is ever required: if you're stuck, there is always a logical next step waiting to be found. Four difficulties change how deep you have to dig for it.

The interface stays out of the way: pencil notes for candidates, live conflict highlighting when a digit breaks a rule, unlimited undo, and a check button that shows which entries disagree with the solution. Times are tracked per difficulty so you can watch yourself get faster.

How to Play

Tap a cell, then tap a number to fill it. Switch to notes mode to pencil in candidates. Conflicts highlight as you go, undo is unlimited, and the hint button fills one correct cell if you want a nudge. Fill the grid correctly to finish.

Cozy Sudoku Tips & Tricks

• Fill every certain cell before you start reasoning — the easy passes often cascade.
• Use notes early on hard boards; the pattern you're looking for usually appears in the candidates, not the grid.
• Scan by number rather than by cell: pick a digit and ask where it can go in each box.
• If you feel like guessing, you've missed something — these puzzles never require it.
• Expert boards reward patience over speed; the timer is a record, not a threat.

Game Details

Cozy Sudoku FAQ