Nintendo DS game Custom Robo Arena (USA) is a science fiction action role-playing game developed by Noise and published by Nintendo. It was released in Japan as Custom Robo GX (カスタムロボGX). The game is set in a world where robots, known as 'Custom Robos', are used in battles by their owners. Players take control of a Custom Robo and battle against other Custom Robos in a variety of arenas. The game features an open-world environment and an RPG-style progression system, allowing players to customize their Custom Robo with various parts and abilities. The game also features a variety of minigames and side-quests. Custom Robo Arena also supports multiplayer battles via the Nintendo Wi-Fi Connection. Custom Robo Arena is an enjoyable and unique game that blends together action, role-playing, and strategy elements. With its unique battle system and customizable Robos, the game offers a unique and enjoyable experience.