Metroid Fusion is the long awaited sequel to Super Metroid for SNES. At the start of the game Samus gets infected with a virus. During the game Samus can pick up more of the virusses to replenish her energy and rockets. The game works the same as the SNES version. It got released at the same time as the Gamecube game Metroid Prime, and can be linked with that if you own both of them original.