fcc.cc/sudoku
- published
A daily sudoku, plus as many more as you want. The puzzles are generated rather than pulled from a list — the generator strips clues out only as long as the grid still has exactly one solution, and difficulty just controls how many survive.
The coach is the part I like. Most sudoku hints fill in a square for you, which solves a bit of the puzzle and teaches you nothing. This one names the technique that applies next — pointing pair, hidden single — and tells you where to look, then lets you make the move yourself.
Three styles to play in (Classic, Quiet Ledger, Nocturne), a move timeline you can scrub back through, undo, and auto-marks.
There’s an iOS app with the same generator and the same coach. It’s on TestFlight.
