When a meteor brings new energy to the world, people start building giant robots for entertainment purposes. These robots fight each other in arena battles to become the Master of Masters. You play two characters who participate in these fights, exploring and completing quests to earn money and items to upgrade your robot. You can talk to city inhabitants and buy new items at stores.
The more you upgrade your Unitron robot, the more noticeable the changes will be. With over 200 different weapon configurations possible, each with its own material and element, you'll need to choose wisely when selecting a part for your robot. For example, fire weapons are better suited against wooden robots than those made of water.
Below the city lies a network of large dungeons where many quests will require solving puzzles and finding valuable items.
The battles in Biomotor Unitron are similar to Pokémon, with you selecting powers from a menu. You'll need to strategically choose your moves to outmaneuver your opponents.