Reaction time game, you can play for 30, 60, or 90 sec. Once you start playing the first light will light up, once you hit the lit up light the next one will light up. New lights will light up untillthe timer is out. It will also keep track of your score.
Here is my blog post with more details: https://soriki.com/makerspace/2020/02/15/reaction-time-game/