In the classic gunslinger show down portrayed in numerous movies, the town clock was often used as the 'go' or 'draw' signal for the two gunslingers. High noon or some other on-the-hour time was used so that the minute hand was the main 'go' indicator. As soon as it pointed straight up, it was time to draw.
For our Circuit Playground Quick Draw game, we'll use the NeoPixels instead. They will initially be all off. The two players should then be at the ready. Then, after a random period of time, we will turn on all of the NeoPixels. This is the 'go' signal at which point the two players press their buttons as quick as they can. The winner is whoever pressed their button the quickest.