Color sudoku, every day.
Classic sudoku, played in color: each row, column, and box holds one of each, never a repeat. No numbers, no timer, no streak-shaming. Take your time.
Free to play, with Hueline+ for practice mode, bigger boards, and unlimited hints.
Straight from the App Store
The daily rounds, the patterns that make it accessible, and the Mosaic your days build.
Three rounds, every day
A gentle warmup, a standard board, and one that makes you think. The same calm audience, a different mental gear.
How it plays
Color as information, not decoration. Each color carries logical content, a signal to be resolved.
Place a color.
Tap a cell, tap a color. No typing, no clutter. Tap and hold to pencil in candidates.
One of each.
Every row, column, and box holds one of each color. Deduce the rest, one quiet step at a time.
Solved.
The last cell clicks into place. Quiet certainty, not a noisy victory. No timer pushed you there.
Built to be seen by everyone.
Around eight percent of men have some color vision deficiency. Hueline is accessible by default, not a mode you switch on.
Six colorblind-safe colors, each carrying its own subtle pattern, so every cell is distinct by texture as well as hue.
The Mosaic
Each solved day adds a tile to a mosaic that is yours alone. Clean solves run richer; quieter days run muted.
Over weeks it becomes a small piece of art, a record of showing up. The pattern is yours to fill, no pressure.
Guides from the Hueline desk
Color sudoku rules, variants, accessibility, and how to actually get better.
Color sudoku: rules and how to play
The same beautiful logic as classic sudoku, no numbers required. How a day of Hueline plays.
Read the guide →Sudoku with colors instead of numbers
Yes, it exists. Why the logic survives the swap, and why it might be better this way.
Read the guide →Colorblind friendly puzzle games
What real accessibility looks like in a color game, and how Hueline builds it in by default.
Read the guide →Sudoku variants worth playing
Killer, mini, diagonal, jigsaw, and color: which variant fits which mood.
Read the guide →How to get better at sudoku
Seven habits that actually work, from scanning discipline to honest pencil marks.
Read the guide →The case for a daily sudoku puzzle
Why one a day beats endless levels, and what to look for in a daily puzzle app.
Read the guide →