Gamelike raycaster where viewer can be moved and rotated by gyroscope sensor. When the viewer has reached the exit to the outer world the games ends.
Video https://youtu.be/0g54CI1bC_A
Arduino Uno/Nano with gyroscope sensor MPU6050 and SSD1306 OLED 128x64 pixel display
Running on breadboard was not very stable for me over time (occassionally i2c-bus freezes). The same circuit soldered on board ran stable.