# One Square: Spot the Odd One — Six differences, 100 puzzles

> Six differences, 100 puzzles (iPhone/iPad app by takeaki ishiyama.)

- Source: https://appshunter.io/ios/app/one-square-spot-the-odd-one/id6814130720 (this page in markdown: same URL + `.md`)
- Developer: [takeaki ishiyama](https://appshunter.io/developer/6809330425)
- Category: Games, Casual, Puzzle
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 6 MB
- Languages: American English, Japanese
- Released: 2026-10-07
- Data updated: 2026-10-11

## What is One Square?

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.

## Is One Square safe?

Not enough ratings yet to assess One Square.

## Is One Square legit?

One Square: Spot the Odd One has limited verification signals. The AppsHunter Legitimacy Score for One Square is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-10-07

One Square is now available in English.

### 1.0 — 2026-09-30

No release notes.

## More apps by takeaki ishiyama

- [Engi — Form & Emptiness](https://appshunter.io/ios/app/engi-form-and-emptiness/id6809330423)

All apps by takeaki ishiyama: https://appshunter.io/developer/6809330425

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-11.*