The difference shows over time
Early on the odd one jumps out. Later the difference no longer fits into a glance and only surfaces if you keep watching: a colour sequence out of order, a lagging phase, a tempo six percent slower, one extra step.
A quiet game of attention
Everyone follows one rule. One is lying.
A field of shapes. One rule they all obey: the same colours in the same order, the same morphing, the same orbit, the same pulse. One of them doesn't. Find it and tap it.
iPhone · iPad · Mac
Try it right here
Every shape below obeys the same rule. One doesn't. Watch a few seconds, then tap it.
A taste of the first levels. In the game the difference gets quieter with every round.
Not spot-the-difference
Several rules at once
At high levels several groups share the field, each with its own valid rule, and the odd one belongs to none of them. The field never stands still, so a memorised layout is no help.
Every round is checked before you see it
The generator measures how noticeable the difference turned out and calibrates it. A round is only shown once it is proven findable.
Three modes
Chain
Endless. Every correct tap raises the difficulty; one mistake ends the chain. No lives.
Quick Game
60 seconds across five difficulties, from Easy to Master. One minute, as many as you can find.
Colorblind Mode
A full separate mode with its own progression and leaderboards, where colour is never the difference — only shape, size, orientation, movement, rhythm and sequence.
In the box
Game Center
Leaderboards for every mode and 15 achievements. Entirely optional.
Accessibility
VoiceOver, Dynamic Type and Reduce Motion — the latter calms the movement without removing the puzzle.
Sound and touch
Haptics on iPhone; every sound is synthesised in the app, so there are no audio files to download.
Nothing attached
No in-app purchases, no accounts, no forced ads — only an optional video to continue a chain.
Works offline
Rounds are generated on the device. Playing needs no connection at all; anything sent afterwards is optional.
One download
iPhone, iPad and Mac, in 12 languages.