For code, schematics and documentation, see https://lunarbadge.github.io .
The badge idea came to us soon after DEF CON 26. We selected the Lunar Lander idea because this year is the 50th anniversary of the Apollo 11 moon landing. We decided a Lunar Lander game on the badge would be cool.
From there, we decided on the form factor, and started work on the code. For the first few months, we used a breadboard with parts purchased from Adafruit.
The software still needed work at this stage :).