Trackballs are great for CAD work, but completely unsuitable for gaming, people insist. I wouldn't be able to react quickly enough, and even if I could, that slippery ball wouldn't give me enough ...
This is a list of arcade games that have used a trackball to interact with the game.World Cup Atari Football Shuffleboard Atari Soccer (1979) Atari Baseball (1979) BullsEye (1980) Centipede (1980) ...
The trackball is powered by the Raspberry Pi Pico running QMK, features a high-accuracy PMW3360 sensor that can be found in commercial gaming mice, and uses a snooker ball for the business end.