I am making an alarm clock with a screen and 6 keys on top. I use an alarm clock app which allows me to play a game in which I memorize a series of squares and click them before the alarm stops ringing. The keys on top will serve as a physical version of that game.
A rocket builder and launch platform based on one of my favourite games, Spaceflight Simulator.
The hackpad mission
Simulates and visualizes the gravitational effects of celestial bodies upon each other.