Aikui: Colour Sudoku

Colour sudoku, free to play and easy on the eyes. Solve with nine colours instead of numbers, on a board everyone can read, colourblind or not. No ads. No subscription. Ever. COLOUR YOU CAN TRUST The default colours are chosen to stay distinct for the common kinds of colour blindness, the same approach trusted in scientific figures. Turn on Pattern Mode and every colour also carries its own shape, so the board stays readable even when colour alone is hard. Accessibility is never behind the paywall. ACCESSIBLE ALL THE WAY Full VoiceOver, Dynamic Type, and Reduce Motion support, plus a Differentiate Without Colour setting that brings the shapes in for you. And it speaks 50 languages, so the game meets you in yours. A CALM PLACE TO THINK No timer, no pressure, no flashing rewards. Just a quiet board, gentle haptics, and a light or dark look that follows your device. Aikui is about depth, not speed. PLAY YOUR WAY Cell-first or colour-first input, pencil marks, undo, and mistake checks. Four difficulties from Gentle to Hard, drawn from a bundled bank of 10,000 hand-checked puzzles that play fully offline and each have exactly one solution. DAILY PUZZLE AND GAME CENTER One shared Daily Puzzle for everyone, every day, with streaks and Game Center leaderboards for mastery, clean solves, and each difficulty. AIKUI PRO, YOURS FOREVER One optional purchase unlocks Medium and Hard, the Daily Puzzle, competitive leaderboards, premium colour palettes, and board styles. Buy it once and you own it. Gentle and Easy, the colourblind-friendly palette, and Pattern Mode stay free for everyone. Where colour meets calm.