Tsukuda Original's Othello Multivision horse racing game, "Challenge Derby." However, it was an OEM version for Sega SG consoles (similar to car OEMs, the internals are the same but the exterior is different), so it also works on Sega SG, Sega Mark III, and Sega Master System. Operation confirmed. - Title: Challenge Derby - Type: Cartridge - Platform: Othello Multivision / Sega SG series - Genre: Horse Racing Game - Condition: Used Junk retro game Sega SC Mark 3 Master System