ナゾのロボカスタムロボ (Nazo no Robo: Custom Robo) is a 3D action-adventure game developed by Noise and published by Nintendo for the Nintendo 64. It was released in Japan on April 28, 1999. The game follows the story of a young boy, who is given a Custom Robo, a miniature robot that can be customized with parts and weapons. The player must battle other Custom Robos in arenas and progress through the story. The game features a variety of customization options, allowing the player to customize their robot with parts and weapons. It also features a wide variety of arenas in which the player can battle their opponents. The game also features a variety of mini-games, allowing the player to test their skills in a variety of different challenges. The game also features an extensive story mode, which follows the adventures of the protagonist as he battles his way through the world of Custom Robo. The game received generally positive reviews from critics, who praised the game's customization options and the variety of mini-games.