[[caption-width-right:350:Now you're-a thinking with-a portals!]]

''Mari'''[[color:#0066ff:0]]''''' (2012) is a fan-made {{crossover}} between ''[[VideoGame/SuperMarioBros1 Super Mario Bros.]]'' and ''VideoGame/{{Portal}}''. You're Mario, and you have a portal gun. You can play through the classic levels from the original [[NintendoEntertainmentSystem NES]] game (but with portals!), try and solve the Aperture Science-themed puzzles based on ''Portal'' and ''Portal 2'', or even [[LevelEditor make your own levels]]. There's a CoOpMultiplayer mode too--up to four players can play simultaneously, much like in ''VideoGame/NewSuperMarioBrosWii''.

The game is available as a [[FreewareGames free download]] at [[http://stabyourself.net/mari0/ its homepage on Stabyourself.net]]. An updated version known as the SpecialEdition was in the works, but due to years of DevelopmentHell, it was cancelled.
!!This game contains examples of:

* AscendedGlitch: The exit pipe the brings the player to the flagpole in 1-2 has an intentional non-solid tile in the upper left of the vertical pipe, in which the player can portal themselves up to it while big, slide through, and go down the first pipe in the WarpZone[[note]] In the game's coding, any Warp Zone pipe marked to transport the player to World 4 will instead send the player to the Minus World if the "Welcome to Warp Zone" text isn't on-screen[[/note]] to enter the MinusWorld. The player can also use the editor to clear a wall through the exit pipe and get to the Minus World easier.
* CameraScrew: In the co-op mode, the screen used to scroll to accommodate the foremost player. Anyone else who fell too far behind got screwed unless the foremost player went back, or unless the player who fell behind managed to catch up with portals. SE would've added a splitscreen to fix this.
* CoOpMultiplayer: 4-player simultaneous, and each player gets his/her own portal gun.
* {{Crossover}}: Not just ''Mario'' and ''Portal'', but it also has a ''VideoGame/{{Minecraft}}'' mode and ''[[WesternAnimation/MyLittlePonyFriendshipIsMagic Sonic Rainbooms]]'' too.
* DifficultButAwesome: Proper use of the Portal Gun is easy to screw up. That said, [[GameBreaker it's a Portal Gun in a game not designed for the Portal Gun]].
* DownloadableContent: One even includes ''[[VideoGame/SuperMarioBrosTheLostLevels The Lost Levels]]''. Thankfully you have the Portal Gun this time.
* DungeonBypass: In addition to the ones present in the original game, the portal gun allows you to creatively get around some obstacles. Use portals for a perfect 5000 flag catch every time, portal behind Bowser to hit the axe, portal ''Bowser behind you'' to do the same, and many more.
* EasyLevelTrick: [[InstantWinCondition Only one player needs to reach the goal to complete the level in a co-op game.]] This can be used to bypass several companion cube puzzles.
* GameMod: These appear from time to time on the forums, taking the form of additional map packs and major mods that add more items/enemies/objects to the game. Alesan's Entities is one of the more notable ones.
* HoistByHisOwnPetard: Hammer Bros. can be killed by their own hammers sent through portals. Humorously, this used to extend to the hammers of other Hammer Bros. as well; a pair of them often thinned themselves out when the one in back started throwing. This was patched in version 1.4.
* {{Knockback}}: An unlockable cheat has Mario ricochet behind himself whenever he shoots with the portal gun. Potential abuse of this can allow players to soar across levels, made much easier if combined with the cheat that allows slowing down time by using the mousewheel.
* KonamiCode: [[spoiler:Entering it at the title screen unlocks the cheats without having to complete the SuperMarioBros levels first.]]
* LevelEditor
* {{Medley}}: The map pack [[http://forum.stabyourself.net/viewtopic.php?f=12&t=2923 ''SMB Extended'']], which combines both ''Super Mario Bros'' and ''The Lost Levels'' into one mappack. A mod only compatible with 1.6 must be used to run it.
* NintendoHard: Subverted for the original and ''The Lost Levels'', since the portal gun is pretty much a GameBreaker, though a few downloadable map packs play this trope straight.
* NostalgiaLevel: UpToEleven.
** Literally the entirety of the original ''Super Mario Bros.'' is playable. The entirety of ''The Lost Levels'' is also playable, as well as a few other miscellaneous remakes, including [[http://forum.stabyourself.net/viewtopic.php?f=12&t=2383 ROM hacks]].
** Other ports include the PC88/Sharp X1 pseudo-sequel ''VideoGame/SuperMarioBrosSpecial'' (available [[http://forum.stabyourself.net/viewtopic.php?f=12&t=1364 here]]), and another of a UsefulNotes/ZXSpectrum [[http://forum.stabyourself.net/viewtopic.php?f=12&t=2713 tech demo]].
** A [[http://forum.stabyourself.net/viewtopic.php?f=12&t=2657 port]] of the original ''VideoGame/TheGreatGianaSisters'' is also available.
* ObviousBeta: [[DownplayedTrope Downplayed]] with the [[http://forum.stabyourself.net/viewtopic.php?f=8&t=4004 open beta of SE]], where the only eye-openers are characters having "-unfinished" in their names, and you can't go onto Adhesion/VideoGame/{{VVVVVV}} Gel with a mushroom. The level editor also crashes quite a bit now due to all the new features added, and ported 1.6 maps can crash in SE's editor due to missing the "Buzzy Beetle Half" entity.
* OffModel:
** Thanks to a rather well-known [[http://www.mariomayhem.com/downloads/sprites/smb1/smb1_misc_sprites.gif sprite sheet]] where most of this game's sprite work was based on, Buzzy Beetles appear to bop up and down as they move, with one of their rows growing an extra pixel in size in one of their frames. Even with how obvious this error is and with fixes available, this was not fixed in SE.
** From the same sprite sheet, we have incorrectly-colored Overworld coins.
* RatchetScrolling: Averted, even for the levels that otherwise look and act very much like ''VideoGame/SuperMarioBros''.
* {{Retraux}}: 8-bit graphics, obviously, to duplicate the style of the original ''Super Mario Bros.'' Averted with the ''Portal'' objects and tiles, as they're more detailed.
* ShoutOut:
** The hats available include [[WesternAnimation/MyLittlePonyFriendshipIsMagic Rainbow Dash's mane]] (it's possible to perform the Sonic Rainboom with one of the cheats enabled) and the eponymous striped top hat of ''Literature/TheCatInTheHat''. Many hats from ''VideoGame/TeamFortress2'' are also available.
** The six additional background colors in SE following the standard three (Sky, Water, and Black) are based on the coat colors of the Mane Six.
* UsefulNotes/SoftwarePorting: {{Averted}}. The developer created the source code from the ground up, in order to avoid the legal wrath of Creator/{{Nintendo}}, as well as accommodate for new physics and fix bugs not present in the original game. However, there were many quirks and bugs present in the first release of the game that have since been ironed out, and even up to 1.6 and the beta version of the SpecialEdition, several objects/features both used and unused in vanilla [=SMB1=][[note]]such as a lack of underwater palettes for overworld enemies and vice versa (as seen in The Lost Levels), Cheep Cheeps not having random spawn-points underwater, Bloopers not being stompable if placed out of water, and Hammer Bros. not coming after the player if they remain on-screen for long enough[[/note]] aren't present, leaving it up to modders to restore these missing contents.
* SpecialEdition: Until it was canceled. Thankfully, it had a mostly-complete public beta.
* SuspendSave
* UntitledTitle: "The Untitled Game" mappack.
* UnwinnableByMistake: Quite a number of fan-created mappacks tend to suffer from this.
* VirtualPaperDoll: Mario's sprite is customizable and can be recolored however you like, and you can even give him a variety of silly hats, mostly from ''VideoGame/TeamFortress2''.