Ketō Transformers Beast Wars: Beast Senshi Saikyō Ketteisen

Kettō Transformers Beast Wars: Beast Senshi Saikyō Ketteisen (決闘トランスフォーマービーストウォーズ ビースト戦士最強決定戦 Kettō Toransufōmâ Bīsutō Wōzu Bīsutō Senshi Saikyō Ketteisen?, lit. "Dueling Transformers Beast Wars: Strongest Beast Warrior Finals") is a video game for the Game Boy Color handheld. It was released by Takara on April 2, 1999 in Japan only, and is compatible with the game Transformers: Beast Wars Transmetals through the use of the Transfer Pak.

Game play
The main feature of the game consist of a single or two player, this includes elements similar to that of the Street Fighter series with basic moves and special attacks. Characters are presented in scaled down SD form. Since this is a Transformers game players will have the ability to transform from robot to beast at will. Depending on the player will determine the special attack. Akin to the Dragon Ball Z fighting game series player will have the ability to build their ki by holding down certain buttons.

Bonus is primarily fun mini games that the player can play for extras. In the beginning the player will only have access to two of the extras in the extras menu. Players can access move mini games by earning code in Japanese which they enter in the password screen.