Game rules · Cognitive flexibility
Sort Switch
A stream of pieces, two bins, one rule — except the rule keeps switching between shape and colour. Task-switching under a clock.
The run
How it plays
- Each piece has a shape (hex/ring) and a colour (volt/ice); the active rule decides which attribute matters.
- You have 2.5 seconds per piece before it counts as a miss.
- Both players face the identical stream and rule schedule.
Cognitive flexibility · 60s runs
Scoring formula · versioned
Every point, accounted for
Integer arithmetic only — the same result on every device, every time. Changing any number creates a new scoring version; old results never change.
| Component | Condition | Points |
|---|---|---|
| Correct sort | piece to the right bin | +40 |
| Speed bonus | under 700 / 450ms | +10 / +20 |
| Switch bonus | first correct sort after a rule change | +30 |
| Streak multiplier | +4% per consecutive correct, cap +60% | ×1.00–1.60 |
| Wrong bin | streak resets | −30 |
| Timeout | piece expires unsorted | −20 |
Fairness
Chance never picks the winner
The challenge is sealed and identical for both players — variety without advantage. Every official score is replayed and verified on the server.
Deterministic challengesServer-replayed scoresNo random tie-breaks