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Official Site: Nintendo

is an action-adventure game published by Nintendo for the Game Boy Advance handheld console in 2002. It was developed by Nintendo Research & Development 1, which had developed the previous game in the series, Super Metroid (1994). Players control bounty hunter Samus Aran, who investigates a space station swarming with organisms infected with virions known as X parasites.

Like the previous Metroid games, Fusion is a side-scrolling game with platform jumping, shooting, and puzzle elements, but introduces mission-based gameplay that guides the player through areas. It was released simultaneously with the GameCube game Metroid Prime in North America; both games can be linked using the GameCube – Game Boy Advance link cable to unlock additional content for Prime.

The game was praised by critics for its action-oriented gameplay. It received several awards, including Handheld Game of the Year at the 2002 Interactive Achievement Awards, Best Game Boy Advance Adventure Game from IGN, and Best Action Game on Game Boy Advance from GameSpot. It was rereleased on the Nintendo 3DS's Virtual Console in December 2011 for select customers as part of the 3DS Ambassador Program, and the Wii U's Virtual Console in April 2014.

Metroid Fusion is an action-adventure game in which the player controls Samus Aran. Like previous games in the series, Fusion is set in a large open-ended world with elevators that connect regions, which each in turn contains rooms separated by doors. Samus opens most doors by shooting at them, while some only open after she reaches a certain point. The way the game unfolds is more linear than other Metroid games due to its focus on storyline; for example, Fusion introduces Navigation Rooms, which tell the player where to go.

X Parasites has not been a contender in any CBUB matches.