Franchise: Metroid
Metroid Dread
Famicom Mini Collection
Nintendo Land
New Play Control! Metroid Prime
Super Smash Bros. for Wii U
Metroid Fusion
Metroid: Zero Mission
Ultimate NES Remix
Super Smash Bros. Ultimate
Metroid: Other M
Metroid Prime: Trilogy
Super Smash Bros. Brawl
Metroid II: Return of Samus
Metroid Prime
Metroid Prime: Federation Force
New Play Control! Metroid Prime 2: Dark Echoes
Metroid Prime Hunters
Metroid Prime 3: Corruption
Metroid Dread
Super Smash Bros.
Metroid II: Return of Samus DX
Super Metroid
NES Remix 2
Metroid
Metroid Prime 2: Echoes
Nintendo World Championships: NES Edition
Super Smash Bros. for Nintendo 3DS
Super Smash Bros. Melee
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The Varia Suit upgrade is actually a mistranslation from Japanese. It was supposed to be "Barrier" Suit, but since Barrier is written roughly as Baria (バリア) in Japanese, the translators mistakenly wrote it as Varia instead, and the name stuck.
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There were plans to make a Metriod game for the Nintendo 64, however the series co-creator, Yoshio Sakamoto, said that he was unable to find a way to control Samus, and when he gave an unknown company the right to make the game, they turned it down thinking it wouldn't live up to Super Metroid.
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Samus' Morph Ball exists only because Nintendo's programmers couldn't animate Samus getting on all fours and crawling through tight spots.
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In an interview, Metroid character designer Hiroji Kiyotake said that the name "Metroid" came from combining the words "android" and "metro subway."
"There was one more staff member, and the two of us decided on it. We attached 'android' to the "metro subway" and that's how we got 'Metroid'."