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Three in One, also referred to as 3 in 1 and The Best Game Collection, is an unlicensed multi-cart for the Sega Master System consisting of three Master System games, published in South Korea by Hi-Com.

It has 6 versions :

Version A : Hang On, Pit Pot, Spy vs Spy.
Version B : Great Baseball, Great Soccer, Super Tennis
Version C : Teddy Boy Blues, Pit-Pot, Astro Flash
Version D : Teedy Boy Blues, Great Soccer, Comical Machine Gun Joe
Version E : Ghost House, Teddy Boy Blues, Seishun Scandal
Version F : Satellite-7, Great Baseball, Seishun Scandal