Dottori Kun
From Sega Retro
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Dottori Kun is a 1990 arcade "game" by Sega. The exact purpose is unclear; System16 claims that it was to help JAMMA board dealers cope with a law saying all boards must be sold with games; the MAME source code claims it was just a JAMMA test board. Whatever the case, it was relatively cheap for the time: a 4Mhz Z80, very basic graphics, and no sound.
The basic goal of this game is that you are the arrow and you must go around the field collecting the dots and avoiding the X. There are two buttons. Button 1 will cause you to move faster when held. Button 2 pauses/unpauses. On older boards, inserting a coin will cause the game to cycle foreground, then background colors; on newer boards, inserting a coin will open a test menu.