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Official Site: Nintendo

Custom Robo, known in Japan as , is a science fiction action video game developed by Noise and published by Nintendo for the Nintendo GameCube. It is the fourth title of the Custom Robo series, and the first title of the series released outside of Japan, which was released in North America.

In this title of the Custom Robo series, each player is called a "commander", who pilots and customizes a miniature "robo" to battle each other in a virtual arena called a Holosseum; the average robo is 32 centimeters tall. The first half of the story takes place in "A New Journey" mode. After the story mode is completed, the player may choose to go through the story again or enter a series of tournaments called "The Grand Battle".

The main objective of the entire game is to engage in battle with other robos, and finish its plot by collecting every custom robo, battle part, and item that the player wants, while winning every battle that moves you from one part of the storyline to the next. In Custom Robo battles, the objective is to reduce your opponent's hit points from 1000 to 0 by using different custom robos and their dash attacks, guns, bombs, and pods.

Robos fight on a Holosseum, a battle arena designed for custom robos. Some commanders can make their own Holosseums, or they can use a pre-created Holosseum taken from a Holosseum deck or in the robo itself. Holosseums come in a variety of sizes and layouts, and some feature environmental hazards such as ice or lava.

Images with a green border may be set as the character's main profile image. For images 200x200 or 300x300 pixels square.

Steel Hearts has not been a contender in any CBUB matches.