When does the reaction timer start?
It starts after every swap is complete, exactly when the timing bar appears and the cup positions become selectable.
Which keys choose each cup?
Press 1 for the left position, 2 for the middle position, or 3 for the right position. The number labels remain fixed while the cups move.
What happens after a mistake?
Standard mode records the mistake and continues through all 12 rounds. Endless mode ends on the first wrong choice or timeout.
What if reduced motion is enabled?
Each swap becomes a clear step: the two affected cups highlight, change places, and pause before the next exchange.
Can I play on a phone?
Yes. Tap the left, middle, or right cup after the shuffle. The board scales to narrow screens without horizontal scrolling.