Huedoku
"Sudoku, in colour."
Huedoku replaces the digits 1–9 with nine soft pastel hues: fill every row, column, and 3×3 box with each hue exactly once. There are four difficulty tiers from Gentle to Deep, a positional notes mode for pencil-marking candidates, a difficulty-gated hint engine, unlimited undo, and gentle conflict detection. Finish a board and confetti of all nine hues rains down. An optional patterns overlay puts a distinct shape on each hue for colour-blind play. 400 puzzles ship bundled in the app, so it works entirely offline — and your in-progress game is always saved. Gentle and Calm are free to play; a single one-off purchase unlocks Focused and Deep — a support-the-devs deal with no ads and no subscriptions.
What's in it
- Colour-only gameplay — no numbers, ever. Nine pastel hues replace the digits.
- Four difficulty tiers — Gentle, Calm, Focused, and Deep, each demanding harder deductions.
- Notes mode — pencil-mark candidates in a positional 3×3 mini-grid inside each cell.
- Hint engine + unlimited undo — fills the most logical next cell when you are stuck.
- Conflict detection with strict / lenient / off modes, plus a gentle shake.
- Patterns overlay puts a distinct shape on each hue for colour-blind support.
- 400 puzzles bundled for fully offline play; in-progress games auto-save.
Huedoku hasn't shipped yet — we're targeting TestFlight first, then the App Store and Google Play. Drop us a line if you want to be on the early build list.
Get on the listNo build yet — but the engine is real.
Huedoku is in active development. Screenshots and a TestFlight link will land here once we cut the first build.