Huedoku: Colour Sudoku

400 hand-tuned puzzles across four difficulty tiers — fully offline. Pay once, play forever. Place the hues, find your calm.

Huedoku is Sudoku reimagined in colour. Instead of the digits 1–9, you place nine hand-picked pastel hues so that every row, every column, and every 3×3 box contains each hue exactly once. Same satisfying logic — a calmer, more tactile way to play.

A PUZZLE FOR THE SENSES • No numbers, ever — nine soft hues replace the digits • Warm, considered palette designed to soothe, not shout • Smooth, gentle animations and a quietly satisfying confetti celebration when you win

FOUR DIFFICULTY TIERS • Gentle — ease in with plenty of clues • Calm — a little more thinking required • Focused — for steady, deliberate solving • Deep — sparse clues and advanced deductions for experts

THOUGHTFUL TOOLS • Notes mode — pencil-mark candidates in a mini-grid inside each cell • Hint system — fills the most logical next cell when you're stuck • Unlimited undo — explore freely, step back anytime • Conflict detection — strict, lenient, or off; your choice

MADE FOR EVERY EYE • Optional patterns overlay adds a distinct shape to each hue, so the game plays beautifully for colour-blind players too

PLAYS ANYWHERE, ANYTIME • 400 puzzles bundled in — 100 per tier • Fully offline: no internet, no account, no sign-up • Your in-progress game saves automatically — pick up right where you left off

PRIVATE BY DESIGN • Pay once — no subscriptions, no in-app purchases • No ads, ever • No accounts, no sign-up • No data collected — everything stays on your device

Whether you have five minutes or fifty, Huedoku turns a moment of logic into a moment of calm. Place the hues, find your flow.