Make a game clock with multiple timers using your Circuit Playground Express. It's easy to get started with just the Circuit Playground itself, and lots more fun to add a NeoPixel strip and some custom switches and buttons using objects you can find around your house.
This is a great project for learning to code with MakeCode, with lots of customizations to play with. Easily change the timer duration, the colors and sounds for each player, and lots more. Keep your kids engaged and having fun as they learn programming basics.
The Circuit Playground Express and a known good data USB cable is all you really need for this project, but here are a few add-ons that will make it more fun: