[[WMG: ''[[Franchise/TheLegendOfZelda Zelda]]'' takes place in the same universe as ''[[Franchise/SuperMarioBros Mario]]'', many years later.]]

[[AC:In the same universe]]
* The castle in ''Ocarina of Time'' has pictures of several Mario characters in the windows.
* ''Link's Awakening'' features Goombas, Piranha Plants, Chain Chomps, Wart and a [[VideoGame/SuperMarioRPG Croco]]-lookalike. (The Wind Fish is apparently in charge of Sub-Con)
* Most houses in ''A Link to the Past'' have portraits of Mario on the walls.
* ''Super Mario Galaxy'' has "Electrogoombas", which in actuality are almost indistinguishable from Octoroks. (pink octopuses that spit rocks at you)
* Link was in the bed in Rose Town in ''Super Mario RPG''.

[[AC:Mario comes first]]
* The cross-references in the ''Zelda'' series are much more prevalent and explicit than those in the ''Mario'' series.
* We already know there are multiple Links; therefore the Link in ''SMRPG'' still fits.
* The ''Zelda'' game with the most references to the ''Mario'' series that wasn't part of a dream is ''The Minish Cap'' (Lakitus and Bob-ombs, among other things), which several theorists believe to be the earliest game in the ''Zelda'' timeline.

* ''Franchise/{{Metroid}}'', ''VideoGame/FZero'', ''VideoGame/StarFox'', and ''VideoGame/{{Pikmin}}'' also take place in the same universe, thanks to references in ''Super Mario RPG'' and ''Mario Golf: Toadstool Tour''.
** As does ''VideoGame/DonkeyKongCountry'', as seen in ''[[VideoGame/DonkeyKongCountry3DixieKongsDoubleTrouble DKC3]]''. If you buy the shell from Bazaar, ask about the castle, and refuse to pay the price, Bazaar says, and I quote, "Are you sure? Some cheeky lad called Link was in last week and he asked about the castle too. He didn't have enough coins, but he seemed such a nice fellow that I agreed to accept 500 rupees instead". And by extension, the newest ''VideoGame/PunchOut'' takes place in this world, as well.
*** Since ''VideoGame/FZero'' and ''VideoGame/StarFox'' seem to take place in the distant future, Hinopio is probably a [[Series/DoctorWho Time Lord]].
* Additional evidence to place ''VideoGame/FZero'' and ''[=StarFox=]'' in the same universe: both the arwings and the F-Zero cars are powered by G-Diffusor Systems, and James [=McCloud=] appears in ''F-Zero'' - one effect of being trapped in the Black Hole was to turn him into a human.
** Either that, or Fox is a half-fox, half-human hybrid. The human half, obviously, is his vocal cords.
*** And his knees.
* Strange inconsistencies between ''VideoGame/{{Pikmin}}'''s Earth and our Earth are there because ''Pikmin'' actually takes place on the Mushroom World. Nintendo products there are not a problem, as they already exist from the ''VideoGame/WarioWare'' games. Real-world brand name products were presumably brought there by the Mario Bros. when they went through the portal.
** Alternately, the ''[=WarioWare=]'' universe is an alternate reality version of this universe, focusing on the exploits of their Wario. Alternately, if ''VideoGame/WarioWare'' is set in the real world, Wario possesses the power to travel between our world and the Mushroom Kingdom, much like Mario and Luigi.
** This also explains why Peach's crown was in ''Pikmin 2''.

You want Grand Unified? Here's Grand Unified:
* ''Kid Icarus'' takes place shortly after the stone age when Medusa used alchemy to turn people into stone. The Angel Pit didn't like it so he killed her.
** A few tribes learned to read Medusa's alchemy books and used them to create their own world so they wouldn't have to share power. This explains why the world of VideoGame/GoldenSun looks like ours but is flat because it was created before anyone knew Earth was really round.
*** Maintaining the world was too hard, however, so everyone built rocket ships and colonized the solar system seen in ''VideoGame/MagicalVacation''.
** In the next ''Kid Icarus'' game, a demon named Orcos tries to unleash four ancient evils on us. He just barely got one through before Pit found and killed him and the other three ancients spend the rest of their lives trying to follow the first. Their story is told in VideoGame/EternalDarkness.
* ''Zelda'' takes place during the middle ages in a kingdom that is eventually lost.
* At that point, the Oocca had left Earth and were evolving into the Chozo. The dragon Argorok's descendants continued to threaten them. Samus's foe Ridley is part of this lineage.
* ''Franchise/FireEmblem'' takes place around the same time, on a different Continent
** ... and one of the games takes place on Terminia.
* When Mario and Luigi were born, they were brought through Mushroom Kingdom before heading to the 'real world'.
* ''VideoGame/DonkeyKongCountry'' occurs in the jungles of the real world
** This has been disproven, as Bazaar, the shopkeeper in ''[[VideoGame/DonkeyKongCountry3DixieKongsDoubleTrouble DKC3]]'', has given Link information about the castle before you met him. See above.
* The original DK headed to Manhattan and was stopped by Mario, who then takes a job as plumber.
* After this, Mario falls back into the Mushroom Kingdom.
* Wario, deciding to capitalize on everything, gets into the Game Industry in the real world (after being continually blocked from riches in the Mushroom Kingdom). He originally starts by selling the Mario story to Nintendo, but eventually forms Wario Ware.
* The DK event resulted in people realizing that sentient animals exist. As a result, these animals started coming out of the woodwork, causing some people to live among them (Animal Crossing)
* Wars break out, resulting in ''Advance Wars''.
* Advance Wars days of Ruin happens, resulting in a near-destruction of everything.
* The animals escape the apocalypse by heading to the stars and forming the Lylat System.
* Events of ''[=StarFox=]'': Somehow James [=McCloud=] is turned human and disappears.
* Further in the future, civilization gets back on track, and the F-Zero circuits are created, and the ''Metroid'' and ''F-Zero'' series occur.
* Pokémon are created in a laboratory, and due to their hyper-abilities knock out most of the native creatures. After spreading to the Midwest of the United States, they impose a quarantine around the zone. Some technology remains (such as Poké Balls, based on reverse-engineering the Morph Ball), but otherwise the people forget about everything beyond the wall.
** A parallel experiment lead to ''VideoGame/{{Geist}}''.
** Why in the American Midwest? There's nothing in the other Nintendo games that would be a FantasyCounterpartCulture of Japan save for [[Videogame/{{Earthbound}} Dalaam]], and that could be just about anywhere in S.E. Asia.
* Note: All games that reasonably could take place in the real world (such as ''Punch-Out!!'' and ''Wii Sports'') do.
* ''VideoGame/SuperSmashBros'' is set at the very end; only the main characters of all games remain, kept alive by Contractual Immortality.
* The ''Franchise/{{Kirby}}'' games are also linked; the Boos from the Mario series are the ghosts of the denizens of Kirby's world, mostly the Waddle Dees. King Boo, their self-proclaimed ruler, is the ghost of King Dedede.
** In ''VideoGame/KirbysDreamLand3'', Samus and some Metroids show up.
* Then where does the ''Earthbound'' series fit into all this?
** Main/{{Eagleland}} is from the imaginations of the people of Pop Star, and Gigyas is the result of influences by Nightmare, Dark Matter, Zero, Zero-Two, Marx and Marx Soul.
** [[Tropers/DonaldthePotholer I'd]] rather Eagleland was real all along... set between [[Videogame/PokemonColosseum Orre]] and [[Videogame/PokemonBlackAndWhite Unova]]. It's a pretty large land, after all, though it would put New Pork City as Chicago instead... [[FridgeBrilliance and Chicago was a meat packing town...]]. Still can't mean that Gigyas isn't the residue hatred energies of the above, though...
** After the defeat of Gigyas, things calm down and the first VideoGame/CustomRobo is created.
** Samus' appearance in VideoGame/KirbysDreamland3 would put the Kirby series in the far future, long after the Modern day set VideoGame/{{Earthbound}} and [[VideoGame/{{Mother1}} MOTHER]].

[[WMG: Princess Peach of ''SuperMarioBros'' was originally a Toad but was hit with the Midnight Bliss attack of Demitri Maximoff from ''VideoGame/{{Darkstalkers}},'' which was interrupted before she could be drained and reverted, leaving her an attractive human-like girl permanently.]]
* It was put forward in [[http://kdingo.net/champ/pics/main.php?g2_itemId=6219 this comic.]]

[[WMG: Ganondorf is the true mastermind of every evil plot ever.]]
We all know that he loves to hijack plots, so why does it have to be limited to ''Zelda''? He has at least some of the Triforce, so what's stopping him?
* Plus the Sacred Realm appears to be an intangible dimension in itself, so it could either be Purgatory or a dimension that links to every alternate universe.
* By corollary, [[VideoGame/MegaMan Dr. Albert Wily]] is merely Gannondorf in the [=MegaWorld=]. After all, you never saw the two of them together, even in [[WesternAnimation/CaptainNTheGameMaster the court of Mother Brain]].

[[WMG: [[Videogame/GoldenSunDarkDawn Morgal]] is the precurssor Kingdom to [[Franchise/SuperMarioBros The Mushroom Kingdom]].]]

A [[{{Prequel}} tie-in]] theory to the primary theory above. And, no, [[Tropers/DonaldthePotholer I]] didn't see the little line to the side of the ''Videogame/KidIcarus'' sub-theory, and now that I have, it strikes me as Farfetch'd. Anyway, my exhibits:

* Belinsk, capital of Morgal, has a landscape that looks as though it was fashioned by an outside yet sentint force. For Example: something that would normally be that far landlocked should not have a port and canal normally.[[note]]Yes, it was probably needed to build the a certain Tower, but still...[[/note]] The Build-to-Suit nature of the area seems like how the site of the Mushroom Kingdom/Toad Town changes [[Videogame/SuperMarioRPG per]] [[Videogame/PaperMario RPG]] [[Videogame/MarioAndLuigi series]] at a minimum.
* Morgal and the Mushroom Kingdom both are homes to HalfHumanHybrids (I'm assuming the Toads are this for the latter) as well as non-Human [=sentients/sapients=].
* In ''Videogame/SuperPrincessPeach'', the eponymous heroine is able to use magical abilities based on her emotions. Or are they not so much magical as ''Alchemical''? Let us examine each:
** Joyous: She is borne up on [[WindFromBeneathMyWings an updraft]]. Note that she is able to hover in [[Videogame/SuperMarioBros2 her first playable appearance]].
** Angry: She emits heat such that [[IncendiaryExponent she causes flammable items around her to burn]].
** Sad: She turns on the OcularGushers, [=watering/flooding/=]'''Dousing?''' the immediate area.
** Content: She restores her health. Note that Venus Adepts commonly have access to the "Cure" class of Healing Psynergy.\\\
Granted, these all are triggered from the use of the Vibe Wand, but with said wand in Bowser's possession, it can be claimed that these powers are latent. Given that the Bros themselves need totems to access their powers (with some exceptions below), this makes Peach special, even when you account for [[AuthorityEqualsAsskicking her]] [[TheHighQueen position]]. Most likely, she has direct bloodlines from skilled adepts in all four elements. Though, given a distnt enough past, the bloodlines could be so spread out that [[ShipToShipCombat it doesn't matter which Jupiter Adept Matthew marries (if either)]], all of the elements will reach royal lines anyway.[[note]]So watch me be wrong and have the Mushroom Kingdom actually be Ayuthay or Tolbi.[[/note]]
* As mentioned above, in the normal games, the Mario Brothers, [[Videogame/NewSuperMarioBrosWii as well as common toads]], can use [=magic/alchemical=] abiltiies when "powered up" with items like the Fire Flower. The ''Golden Sun'' series also has items that can allow the learning of Alchemy outside of an adept's class, like the Frost Gem (which has a Mario equivalent in the Ice Flower).
** The eponymous brothers also seem to have latent powers in the ''Videogame/MarioAndLuigi'' series and in ''Videogame/SuperSmashBros''. Mario is definitely a [[PlayingWithFire Mars]] inate, whereas Luigi is somewhat 50/50 between Mars and [[ShockAndAwe Jupi]][[PsychicPowers ter]]. Again, doesn't mean that they can't use Venus or Mercury totems; in fact, being an inate seems to be a prerequisite in the ''Golden Sun'' series.

In addition, the Koopa Tribe could be the descendants of the Proxians.

Additions? Objections?

[[WMG:The Dark Star from ''VideoGame/MarioAndLuigiBowsersInsideStory'' is an artifact of the Ancients in the ''Franchise/{{Kirby}}'' franchise]]

Considering an image of it appears on [[spoiler:the Lor Starcutter's sail during the fight with it and Magolor]] in ''VideoGame/KirbysReturnToDreamLand'' and that it carries the star motif (albeit in the ''Mario'' style) and is so hugely powerful like so many other Ancients-linked artifacts, it seems plausible the Dark Star originally crash-landed in the Mushroom Kingdom from ''Kirby'' territory.

[[WMG:[[VideoGame/PokemonBlackAndWhite Unova]] and [[VideoGame/{{Mother}} Eagleland]] are both part of the [[VideoGame/SuperMarioOdyssey Metro Kingdom]].]]

All three locales are based on the U.S.A. in some capacity, and New Donk City, the only part visited in ''Odyssey,'' is shown to be on the western edge of its continent. This would leave room for Eagleland (said to be rural America, which is generally the inner land) and Unova (which is on the south to southeastern edge of wherever it is situated).