Hueku: Color Sudoku

Sudoku without a single number. Same logic, no math, no timer breathing down your neck. Just colors falling into place until the grid goes quiet.

Hueku is sudoku — but with colors.

Instead of numbers 1 through 9, you place 9 hand-picked colors on the grid. Same rules you already know: every row, column, and 3x3 box must contain all 9 colors exactly once. New way to see it.

WHY COLORS?

Numbers train your logical brain. Colors train your visual brain. After a few puzzles, you stop thinking "what's missing" and start seeing it. It's calmer, faster, and feels nothing like the math homework version.

4 DIFFICULTIES

• EASY: gentle introduction, 5 lives, around 40 colors pre-filled
• MEDIUM: the daily-coffee level, 4 lives
• HARD: for when easy feels like reading, 3 lives
• EXPERT: sparse boards that take real concentration, 3 lives

Every puzzle has exactly one solution. Generated locally on your device. No internet required.

DESIGNED TO RESPECT YOUR TIME

• No accounts. No login. No email.
• No banner ads cluttering the screen.
• Optional rewarded ads: only when YOU tap to restore a life or reveal a hint.
• Or unlock Hueku Pro ($3.99 one-time) to remove ads forever.
• No notifications begging you to come back.

ACCESSIBILITY

• Optional 1-9 number labels on top of each color, for color-vision accessibility.
• Adaptive light and dark themes: switches automatically with iOS.
• Full VoiceOver labels.
• Adjustable haptic feedback.
• Available in 15 languages.

WHAT YOU TRACK

• Personal best time per difficulty
• Current streak and best streak
• Score breakdown after each win
• "New Best" celebration when you beat your record

All stored locally on your device. Never uploaded anywhere.

Hueku is built by a small independent studio. We don't sell your data, because we don't collect it. Download Hueku. Slow down. See in color.