This uses an ESP32 with a 64x32 RGB LED matrix. The LED Matrix is driven by SmartMatrix with the ESP32_THT_V0 latch based method. The git repo contains 3d print files, board schematic and layout and firmware source.
On power on you have to choose the game score limit between a normal 21 point game and a short 15 point game. Use the button on the same side as the game limit you want. After that a short press on either side button increments the score on that side, a long press decrements the score in case of a mistake. A short press on the middle button swaps the score from side to side, a long press will reset the score back to 0 and a very long 10-15 seconds will perform a reset allowing you to change the game limit.