Goal

Shapes fall in three colours. Tap the bin of the same colour the instant you see it — only the colour matters, not the shape.

Rules

• A bin tap always sorts the lowest shape — it glows, with a pointer above it.
• Every 10 seconds the shapes speed up, and more fall at once (up to 4).
• Every 15 seconds the bins swap places. They wiggle just before — don't rely on muscle memory.

Scoring

A catch earns 3 + the speed stage (3 at the start, 10 at top speed), plus 1 for every 5 in a row (up to +3). The wrong bin costs 5 (the shape keeps falling). A shape that falls through costs 3. Both reset your streak.

Choice Reaction Time

Seeing a colour and picking the right one of three responses — fast — trains the decision speed behind everyday quick reactions.

Cognitive Flexibility

When the bins shuffle, you have to drop the old mapping and adapt instantly — a key executive-function skill.