Four levels
Easy, Medium, Hard, and Very Hard.
Alga Games
A clean 9×9 grid, four difficulties, puzzles generated on your device. Hints, undo, a timer, and Dark Mode. No account. Built so you can sit and think.



Easy, Medium, Hard, and Very Hard.
Puzzles are generated locally. No account.
Hints, undo, reset, and error tracking.
For late puzzles, easier on the eyes.
Leaderboards per difficulty if you want to race yourself.
About 7 MB. Ready for the train.