Custom Robo is set on an unknown planet in a futuristic world where custom robos are used for criminal purposes. The game follows a group of individuals known as "Commanders" who possess the ability to control robots using brain waves. When they discover a powerful autonomous robot, they embark on an investigation to uncover its secrets.
Custom Robo combines action, simulation, and RPG elements in a unique gaming experience. Players can assemble their own robot using over 200 parts, including guns, bombs, pods, and legs. The game features various battle modes, such as two-on-two, tag team, and four-player battles, each requiring different strategies and tactics to emerge victorious.