Ninebloom: Sudoku with hints that teach
A calm, colourful Sudoku for Android. Every hint names the technique and shows why it works, so you get better with every puzzle instead of just getting the answer.
No login, works offline. Optional Ninebloom Plus for more ways to play.
What's in it
Hints that teach
Each hint names the technique, from naked singles to Swordfish, highlights the cells and explains why. Unlimited and free.
Rated by technique
10,930 classic puzzles across six levels, each rated by the hardest move it needs and checked for one solution. How it works
A puzzle a day
The same daily puzzle for everyone, with streaks that forgive a missed day.
Learn
Twelve techniques explained, each with practice puzzles. The guides on this site come from the same engine.
Nine ways to play
Classic and Mini free in full; Killer, Jigsaw, Thermo, Diagonal, Windoku and more with Plus. The rules
Made for every player
Large print, high contrast, screen-reader play and a left-handed layout, all free. Accessibility
Free, and what Plus adds
Free for everyone, always: classic Sudoku at all six levels (every one of the 10,930 puzzles), the daily puzzle and streaks, unlimited explained hints, notes, colouring and every assistance setting, Mini 6×6, Learn and the accessibility settings.
Ninebloom Plus (yearly, with a 7-day free trial, or once for life) adds the other ways to play with a new one every month or two, a monthly puzzle pack, technique drills, solve replays and more themes. The free app has one optional rewarded ad for a bonus; hints never cost an ad.
More about the app, its privacy policy and terms: leafyorb.com/apps/ninebloom.