Sudoku · Browser game
Grid Gym
A little workout for your mind.
Give your mind a little exercise each day. Work from a 4×4 warm-up to a 9×9 challenge, with pencil marks and a reasoning coach to help you solve at your own pace.
Works with touch on mobile and a keyboard on desktop; progress is saved in the current browser.
About the project
No rush, and no need to guess. Grid Gym turns Sudoku into a daily practice you can start and pause whenever you like. Choose a size and difficulty that suit you, then begin with a square you can solve with confidence.
What you can do
- Choose 4×4, 6×6, or 9×9, each with three difficulty levels and a fixed daily puzzle.
- Add pencil marks yourself or fill them in at once; the reasoning coach explains why a number belongs in a square.
- Pause for a break, undo a move, or return in the same browser to continue your last session.
Where it stands
Playable in your browser. Daily puzzles, training history, elapsed time, and best times without hints are stored in the browser on your current device; progress does not sync across devices.