Trigger the flicker that swaps between two near-identical scenes, then click every shape that quietly changed, before your attention runs dry.
Was this fun?
How to play
Each level shows a grid of shapes. Press Flicker to blank the screen and switch to the altered scene; a few cells have changed colour, shape or rotation across the blink. Click each changed cell to mark it. Finding them all clears the level and the next gets busier. A gaze budget drains while you study a scene, and exhausting it too many times ends the run.
Flicker to reveal the change, then click every cell that shifted
Correct finds score; wrong clicks set you back
Clear all changes before your gaze budget empties
Controls
Desktop: click Flicker to toggle scenes, then click the changed cells.
Phone & tablet: tap Flicker and tap cells, touch supported.
Game modes
Daily: one shared seeded ladder of levels
Practice: fresh seeded levels to grind
Tips & strategy
Flicker repeatedly and watch one quadrant at a time, change blindness hides differences in plain sight
Rotations are the easiest to miss; check triangles and diamonds for a turned orientation
Commit only when you're sure, since misclicks cost more than another flicker
What you'll learn
Spot the Shift is a spot-the-difference puzzle that weaponises the flicker effect, training visual attention against change blindness.
For parents & teachers: trains careful looking and change detection.
About Spot the Shift
Spot the Shift is an original free browser spot-the-difference puzzle that weaponises the flicker effect from change-blindness research. Built in-house for PlayPendium.
A free, original browser game on PlayPendium. No download, no install.
