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Context Trivia / MetroidFusion

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1* DummiedOut
2** Several classic ''Metroid'' enemies such as the Skree and Geega can be found unused in the game's files. There's also data for the bugs that would come out of a Kago when you shoot one in ''VideoGame/SuperMetroid'', whereas in this game nothing happens.
3** There are several rooms leftover in the game. In the Debug Room, you can find sprites from ''VideoGame/WarioLand4'', since this game is built on a heavily modified version of that game's engine. There's also a modified Neo Ridley arena made to resemble his arena from ''Super Metroid''.
4** The Debug Menu is left intact, but it requires cheats to access. Much like ''Super'', you can toggle which upgrades to have on and/or off, like having ''just'' the Charge and Ice Beam.
5** There are unused sprites of the Scientist getting violently blown to the side upon getting shot. In the final, unaltered game, the Scientist calmly turns to the side before reverting to a Core-X.
6* FirstAppearance: Of the X-Parasites, who would go on to become major antagonist of the franchise after this game.
7* GodNeverSaidThat: When ''VideoGame/MetroidSamusReturns'' was released, some fans cited a [[TheyWastedAPerfectlyGoodPlot wasted opportunity]] to make a CallForward by showing bosses from ''Fusion'', such as Serris and Yakuza, in their natural habitat. However, the creatures canonically native to [=SR388=] are only found in Sector 1; most bosses[[note]]which, with the exception of Neo-Ridley, are all encountered outside Sector 1[[/note]] are of unknown origin. This confusion seems to stem from the fan-made ''VideoGame/AnotherMetroid2Remake'', which includes Serris as a boss and provides lore referring to it as the apex aquatic predator of [=SR388=].
8* WhatCouldHaveBeen:
9** The 2001 E3 preview, at that point simply titled ''Metroid IV'', looked quite different and had several gameplay mechanics that didn't make it into the finished game, including it apparently taking place on a moving space ship rather than a station, and Samus having the ability to walk on walls (possibly inspired by the Spider Ball from ''VideoGame/MetroidIIReturnOfSamus''). The trailer drew a great deal of criticism for looking like it belonged more on the Platform/GameBoyColor than the UsefulNotes/GameBoyAdvance. With that feedback, Nintendo went back to the drawing board, and at the next year's E3 ran a preview looking much more like the finished game.
10** There wasn't even a plan to develop a ''Metroid'' game for the GBA originally, until Nintendo saw the extremely positive Western reaction to the ''VideoGame/MetroidPrime'' Spaceworld 2000 trailer.
11* WordOfDante: In official media, the only ''Fusion'' enemy with "-X" attached to the end of its name is the SA-X. Yet, it seems almost universally accepted among the fandom (including major ''Metroid'' fan websites such as Metroid Database, Metroid Recon, Wikitroid, and Metroid Wiki) that creatures infected and/or mimicked by the X parasites follow that naming scheme (Hornoad-X, Arachnus-X, etc.). It's not clear if this originates from an obscure official source or if it is simply fanon that has become so well known that it's nearly indistinguishable from canon. ''VideoGame/MetroidDread'' is inconsistent about whether it's now AscendedFanon when referring to X-infected creatures.[[labelnote:(spoilers)]]Raven Beak X is the only example that explicitly follows the naming scheme in-game, but even its name differs slightly from SA-X in that it is not hyphenated. No other examples use this naming scheme in-game (e.g. Chozo Soldiers are never called Chozo Soldier-X on the Map or Mission Log screens). The [[AllThereInTheScript internal files]] sometimes use "X" or "-X" as a suffix for some creatures, but the canonicity of this is debatable at best (for example, the internal files refer to "Cooldown-X", which is canonically named Experiment No. Z-57 in-game without any "-X" in its name).[[/labelnote]]

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