Teddy Boy Blues - Yohko Ishino is a 1985 arcade game made by Sega. It stars a young boy who is armed with a gun who has to go through mazes of monsters. He has to destroy all of the monsters within a time limit. When a monster is shot, it turns into a ball, which must be collected quickly, else it will fly to the time limit bar and consume a chunk of it. If the boy is touched by a monster or if the time limit runs out, the boy loses a life, and the game ends if he loses all of his lives.
The name of the arcade version was a reference to a 1985 hit song entitled "Teddy Boy Blues" by then-popular Japanese pop star Yohko Ishino, an instrumental version of which constantly played in the background during the game. An animated version of Ishino also appeared on the title screen and during the bonus rounds.
Teddy Boy was re-released in Brazil by Tec Toy under the title Geraldinho. The hero was replaced with the character Geraldinho, who originates from a comic strip by Brazilian cartoonist Glauco. This version gives the player five lives to start with, while the original game gave the player three lives.
The game was ported to the Sega Genesis, and virtually completed, but never released.