Urjo.com is a challenge where you figure out which spots are red and which are blue.
- Each line must have an equal number of red and blue spots.
- Numbers indicate how many surrounding spots are the same color as the numbered spot.
- Two lines next to each other must be different.
Hint: Tap and swipe up or down 📱👆↕️ to pick a specific color. Super handy on smaller screens!
Set up profile to track progress, set your flag and initials, choose your preferred difficulty level, and get your initials on the Top list.
- 2025-10-23 Tap a specific solve on the completion screen to watch Urjo.com solvers solving challenges live.
- 2025-08-21 Pair Urjo.com solvers against each other. Solvers are compared based on number of mistakes and the time it took.
- 2025-08-05 Added challenge and solver ratings. After you complete a challenge your rating will adjust based on how difficult the challenge was. Get your initials and flag shown on the Top list.
- 2025-05-23 Added engine to review Urjo.com challenge solves in great depth. See where you made a mistake, or had to make a lucky guess.
- 2025-05-08 New update. Compete with other Urjo.com solvers. Sign in with email to keep track of solved challenges both on desktop and on mobile.
- 2025-04-21 1,000,000 solved Urjo.com challenges. 🎉
- 2018-06-14 New update. Compare your solving times with others on a histogram.
- 2017-08-15 0:32:26 WR IL Speedrun || Urjo - 8x8 - 1 Difficulty
- 2017-08-15 0:14.07 Former WR IL Speedrun || Urjo - 6x6 - 1 Difficulty
- 2017-08-14 0:57.70 WR Speedrun || Urjo - 4x4 1-5 Run
- 2016-05-27 Piritta @MPMP1974 on x.com
- 2016-02-19 First version. Solve Urjo.com challenges with various difficulty levels.