Part of the hugely popular "Mega Man" series that found plenty of success on Nintendo's early consoles, "Mega Man X3" is also one of the rarest SNES games. It was released in 1995 and follows the story of the previous "Mega Man X" titles, where futuristic humans live in a world alongside sapient robots. As part of the plot, X and Zero battle against a scientist creating an army of evil robots to put a stop to his plans.
Like its immediate predecessor, "Mega Man X3" utilizes the graphic enhancement chip known as the Cx4 chip. Similar to the Super FX chip used in "Star Fox," this allowed for 3D graphics on the SNES and was built directly into the cartridge. This made manufacturing the game more expensive than a typical SNES title and so Capcom only made it in small numbers to make sure that none of the cost went to waste.
The Cx4 chip does give "Mega Man X3" some of the best graphics on the console but it has also led to an increased price. Even loose copies of the game can cost more than $700, with new sealed versions selling for $8,400.