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.
Tap and pull up or down to choose a specific color for a spot.
Set up profile to track progress, set your flag and initials, choose your preferred difficulty level, and get your initials on the Top list.
- 2025-08-21 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.