Franchise: Metroid
Metroid Dread
Metroid Prime: Trilogy
Super Smash Bros. for Nintendo 3DS
Super Smash Bros. for Wii U
Nintendo Land
New Play Control! Metroid Prime 2: Dark Echoes
Metroid: Other M
Metroid Prime 2: Echoes
Metroid: Zero Mission
Super Metroid
Metroid II: Return of Samus
Metroid Prime Hunters
NES Remix 2
Metroid Prime 3: Corruption
Famicom Mini Collection
Metroid II: Return of Samus DX
Super Smash Bros.
Ultimate NES Remix
Super Smash Bros. Melee
Super Smash Bros. Ultimate
Metroid Prime: Federation Force
Metroid Fusion
Metroid Prime
Metroid Dread
New Play Control! Metroid Prime
Metroid
Nintendo World Championships: NES Edition
Super Smash Bros. Brawl
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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'."