Trump Boy is a collection of three traditional card games: Daifugō, Speed, and Nervous Breakdown. The story revolves around these games, where players compete to win advantages and outdo their opponents in each round. The game takes place on a luxurious yacht, where the player with the highest rank gets to start the next round, while those at the bottom have to give away their best cards.
The gameplay of Trump Boy is centered around card-shedding and strategy. Players must play higher cards or sets than their opponents to win them. Speed, a two-player variant, requires players to lose their cards by discarding them to a pile that matches or is one below or above the top card's value.
Trump Boy can be played against the computer or a second human player via Game Link cable. This allows for a variety of gameplay experiences and challenges, making the game appealing to players looking for different levels of difficulty and competition.