Field Day (c) 1984 Taito.

>>> TECHNICAL DETAILS
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Game ID : A23
Main CPU : Z80 (@ 4 Mhz)
Sound CPU : Z80 (@ 4 Mhz)
Sound Chips : AY8910 (@ 2 Mhz), MSM5232 (@ 2 Mhz), DAC (@ 2 Mhz)
Screen orientation : Horizontal
Video resolution : 256 x 224 pixels
Screen refresh : 60.00 Hz
Palette Colors : 1024
Players : 4
Buttons : 3

>>> TRIVIA
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This game is known in Japan as 'The Undoukai'.
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.

>>> OTHER GAME RESOURCES
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Game's rom.