The elk test is a response time game for two players.
If you hear the elk, press the button as fast as you can.
It's made as an short and easy game for kids. It runs on Windows, but should be played on Android. It's designed for an Android tablet which has two buzzer attached to it.
It's an older hardware project which I ported now from XTend code to Kotlin. In this state the texts are hard coded in German.