Zero4 Champ: Doozy-J is a racing game from Zero4 Champ series that comes with a full story mode with anime-style characters, and covers latest car models from six car manufacturers. Side from single-player story mode, the game includes VS two-player race where one can compete against a CPU or another player on the same screen, and time/speed attack mode. During the story mode there is an adventure style gameplay where player has options such as move somewhere, talk to other characters, look at something, or use an item.

Aside from the main game, there are several mini-games, such as cards, slot machine, RPG, which appear in the story mode, but can also be played as standalone. Some of not listed mini-games also include:
Mezashi de Pon! - Platform game where you launch harpoon at various fish and underwater life from your boat. The player can only regular the angle of fire and time of launching the harpoon. The goal is to get as many fish within the allotted time.
Long Shoot - Basketball free kick mini-game where player can choose the angle at which to throw the ball at the net. This mini-game supports two players who throw the ball at the net in turns, first one who scores five nets wins. This mini-game uses side-view perspective.
The Storehouse - Top-down puzzle game where you need to properly stack boxes which come in various shapes in the allotted space before the time runs out.
Arm Champ - Arm wrestling mini-game from the first-person perspective showing only the player's and opponent's arm.