Sudoku
in color.

All the logic you love, in nine bright colors instead of numbers. Daily challenges, monthly trophies, and hints that teach you real technique.

Play free in your browser How to play
No account. Nothing to download. Every difficulty unlocked, right now.

A puzzle every day

One board a day, the same one for every player, with a monthly trophy to collect.

Hints that teach

If you get stuck, tap Hint. It walks you through the reason, one step at a time.

Colorblind friendly

Turn on symbols and every bubble gets its own shape as well as its own color.

Nothing in the way

No account, no setup, no clutter around the board. Open it and play.

tap bubble · tap cell ✦

One board a day. Everyone plays the same one.

A fresh puzzle at midnight, the same board for every player in the world. Nobody gets a head start. The colors only show once you press play, and when you finish you see how you placed against everyone else who played today.

Play today’s daily
Today’s puzzle Today …
– bubbles to start –:––:–– until the next board

Today’s real layout, with the colors held back until your timer starts.

One rule. Four difficulties.

Fill every row, column, and 3×3 block with all nine colors, no repeats. That is the whole game. What changes is how much of the board you start with, and how much technique it takes to finish.

The four difficulties
Easy Plenty of bubbles to start. A good place to learn the shapes.
Medium Fewer bubbles to start. This is where notes begin to help.
Hard Notes matter. Matching groups and locked colors both show up.
Expert Real technique required, all the way up to X Wing and Swordfish.
Where to start
Try the interactive tutorialLearn the game on a real board, in about two minutes. → Read the rulesEvery rule of the game on a single page. → Learn the techniquesFifteen worked examples, from the simplest pattern up to Swordfish. →

Fifteen techniques, each one taught.

Every technique has its own worked example on a real board, from the first thing a beginner learns to the patterns that crack an expert puzzle. The in-game hints use the same names.

Basics

  • Full House
  • Last Remaining
  • Last Possible
  • Notes

Easy

  • Obvious Single
  • Hidden Single

Medium

  • Obvious Pairs
  • Obvious Triples

Hard

  • Hidden Pairs
  • Hidden Triples
  • Pointing Pairs
  • Claiming Pairs

Expert

  • X Wing
  • Swordfish
  • Test a Bubble

Questions

Is this the same as normal sudoku?

Yes. The rules are identical. Every row, column, and 3×3 block holds all nine, no repeats. The only change is that a color stands in for a number, so you read the board by sight instead of by reading digits.

Do I need an account?

No. There is no sign-up and nothing to download. Your progress is saved on your own device.

Is it free?

Yes. Every difficulty is unlocked in the browser right now, including the daily challenge.

What if I’m colorblind?

Turn on symbols and every bubble gets its own shape as well as its own color. The nine hues are picked and tested to stay apart from each other.

Will a hint just solve it for me?

Only if you want it to. A hint names the technique that applies and walks through the reason one step at a time. You can stop as soon as you see it.

Does it work on my phone?

Yes. The browser version works on a phone, a tablet, or a computer. The iOS and Android apps are coming soon.

Play a board right now.

Free in your browser, with every difficulty unlocked. Coming soon to iOS and Android.

Play Bubble Sudoku
Coming soon to theApp Store Coming soon toGoogle Play