Tekken Card Challenge is a turn-based fighting game released only in Japan for the WonderSwan. It uses the characters from Tekken 3 plus an exclusive character to the game named Crow.
Tekken Card Challenge utilizes a system similar to Nintendo's Pokémon games. Two opponents are to fight at a time, with various cards for different maneuvers and a 100 point HP total for damage accumulation. The player begins with a hand of four cards, drawing more as the duel proceeds.
The battle system is similar to Yu-Gi-Oh! in that the three types of cards perform in a rock, paper, and scissors pattern. Attack cards are played against each other to compare values with the loser being discarded and deducting HP, an attack card played against a defense nullifies each other, and two block cards cancel each other out. There is also a minor system of air juggling, which can be quite damaging given the correct order of cards.
Tekken Card Challenge also provides the player with a variety of game modes. There is a link mode present, 1-player battle, 2-player battle and Adventure, which allows the player to unlock more characters and duel opponents. In adventure mode, the player is given movement of a character sprite in a full environment taken place on a 15 x 15 square grid to traverse. The point of each stage is to defeat each "duelist" given limited number of steps and gain entrance to the exit.