Play starts a 60‑second round using the currently selected difficulty.
Pause / Resume halts and restarts the timer (resume shows a short 3‑2‑1 “GO!” countdown).
Reset ends the current round and clears the board.
Mode buttons — Easy / Medium / Hard / Expert — all use quadratic scoring and adjust dot spawn rate. Hard and Expert also increase dot growth speed.
Score and Time update live in the HUD. Timer turns red in the final moments.
Accuracy is calculated as hits ÷ total clicks (hits + misses).
Reflex stats: Median RT (typical performance), Avg RT (overall performance), and 90th% RT (a measure of consistency, showing how slow your slower hits are).
Mobile: on touch devices the game is slightly harder to balance multi‑finger tapping.