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