Space Invaders X (Japan) is a Game Boy Color title likely offering a variation on the classic Space Invaders formula. The "X" might denote enhanced gameplay, additional features, or a different visual style compared to the original.  Being released in Japan, the game might have incorporated elements particular to that region's gaming culture. Without further details, the specifics of the modifications or changes from the standard Space Invaders remain uncertain.

Space Invaders X (Japan)

South Park (Game Boy Color Prototype)