The Undoukai was released in May 1984 in Japan.
The title of this game translates from Japanese as 'The Athletic Meet'.
When playing against the computer, it's uses the abbreviation Z80 - which refers to the processor on the PCB board.
The game is clearly related to Konami's "Circus Charlie
", "Track & Field
" and "Hyper Sports
" games, sharing many identical graphical items, yet was released by Taito. The tilemaps contain the same type of 'bonus' graphics, but it is unknown how they are triggered.