Focus · playable
Change Catcher
Compare two original PlayNib vector scenes and select the area where one reviewed detail changed.
Choose a view
Compare one original vector scene
Four comparison modes
How it works
Flicker
Scene A and Scene B alternate around a brief neutral interruption. A warning appears before this mode.
Side by side
Both scenes remain visible in an untimed comparison designed for steady scanning.
Object Shuffle
Study a tray of three to eight objects, then identify the two that swapped positions. For example, a mug and a ball may trade places. Study and answers are untimed, with labelled buttons for touch and keyboard.
Snapshot
Study Scene A briefly, pause, then identify the changed area in Scene B.
Read results narrowly
What the result does not mean
Missing a change does not infer an attention disorder, visual-health condition, or lasting personal ability.
Ways to compare
Accessibility
- ✓ A 4 × 4 keyboard grid provides a non-pointer selection method.
- ✓ High-contrast outlines reveal the changed area after the round.
- ✓ Reduced-motion preferences automatically replace Flicker with Side by side.
- ✓ Side by side is untimed and no instruction relies only on colour.
- ✓ Object Shuffle is untimed, with labelled object buttons and a text list of tray positions.
Change Catcher FAQ
Are these licensed photographs?
No. Comparison scenes use PlayNib’s reviewed starter pack; Object Shuffle uses original vector objects.
Can Flicker be disabled?
Yes. Side by side, Snapshot and Object Shuffle are always available, and reduced-motion preferences prevent Flicker from starting.
How do hints work?
Hints progress from a broad half, to a quadrant, to an object-category clue. Each one reduces points.
Are party targets sent to players?
No. Mind Party public snapshots omit the target and hit region; normalized taps are validated by the server adapter.
Related Mind Lab activities
Focus Shift
Respond to simple symbols while the active rule changes. The interesting moment is often the first response after a switch.
MemoryMemory Detective
Recall details from a scene or word list, then discover how plausible missing details can sometimes feel familiar.
Present momentTime Warp
Watch a simple visual event without a clock, then estimate how much time passed.
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