How Many?

You get 8 rounds. Each round counts down 3 – 2 – 1, then a group of identical shapes appears for a few seconds and vanishes. Type how many you think there were and press Enter. You do not have to be exact — a round scores 100 for a perfect guess and slides down toward 0 the further off you are, so a close estimate still scores well. There are more shapes every round, and a different shape each time. Your score is the total across all 8 rounds, out of 800.