Mysterious electronic devices

Project Overview

Over the years I've built multiple simple devices, ranging from wirelessly controlled detectors, to time machines, as were needed for various games for children. Usually it's something that emits a sound in a certain situation, or displays something on an LCD, along with a cool-looking 3D printed case. I probably won't put many pictures of them here for the unlikely case that someone involved in the game would find that it indeed wasn't magic :O