I made this game after seeing a professionally made version which was sold for about 1.500€. This one cost me about 20€ for the switches, some electronics and my lunchbox from primary school as housing.
After starting the game, the lights will switch on and off in a random pattern. If you push a button belonging to a switched on light you score. If you push a button with a switched off light you lose a score. After 30 seconds the player with more points wins. Easy. Check the link on the left for a gameplay video.
To make this project acceptable for the 1K challenge I optimized the code and replaced several parts. The .bin file is now about 686byte in size, so there is still room for improvement. Maybe some Fading for switching the lights on and off or a RS232 output for a highscore.