One Square: Spot the Odd One
Six differences, 100 puzzles
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
One square is different. Color, move, shape, pattern, blur or timing — find it across 100 puzzles while the difference quietly shrinks. Share a SEED and race a friend.
Find the one square that is different from the rest.
There are six kinds of difference:
Color — its color is slightly different
Move — it moves slightly differently
Shape — its shape is slightly different
Pattern — its pattern is slightly different
Blur — its outline is slightly more or less sharp
Timing — it changes once, then changes back
Anyone can solve level 1. By level 100 you can barely tell them apart.
For color, the difference (ΔE2000) shrinks from about 9 to 0.8 —
quietly, one puzzle at a time.
■ See what was different
After each answer, the two squares are shown side by side with the exact difference.
For color, which of red, green or blue moved; for motion, how much the range differed.
The ones you missed are the most surprising.
■ Same SEED, same 100 puzzles
A SEED is a short code like "C-8K4M2P".
Share it, and anyone on any device gets the same 100 puzzles in the same order.
Race a friend on exactly the same puzzles.
■ Sight
Your best level is recorded for each of the six kinds and shown on a radar chart,
so you can see which differences you are good at — and which you are not.
■ How to play
Three plays a day, 100 puzzles each.
Once you have gone far enough, you can start from half of your best level.
You have three skips per play. Miss after using them all, and the run ends.
No sound. No notifications. Ads appear only if you choose to watch one for an extra play.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
One Square is now available in English.
The developer, takeaki ishiyama, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- takeaki ishiyama
- Size
- 5.9 MB
- Category
- Puzzle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 いたひソフト