History YMMV / SuperMarioBrosX

** Finally, the concept of having a Piranha Plant as a weapon introduced in SMBX as "Toothy". This would then find its way to SuperMario3DWorld and ''VideoGame/MarioKart8'' in form of Potted Piranha Plant-item.

** Rinkas. As in the energy rings that continually shoot at you, straight from the ''{{Metroid}}'' series. The worst thing about them being that you cannot stop them from coming until you run away.

** Yoshi is back from VideoGame/SuperMarioWorld, and he's just as useful here as he was there. The original 4 colors return and are joined by new varieties, including a purple Yoshi that can GroundPound ''YoshisIsland''-style and a pink Yoshi that turns everything it eats into veggies (which it can spit back out). However, Yoshi with a blue shell (or blue Yoshi with any shell) has been nerfed, and is now merely about as flight-capable as Raccoon Mario - he can't keep gaining height forever. Considering that Raccoon Mario's flight is somewhat game-breaking in its own right, this is less severe than you might think. In early versions, Yoshi with a blue shell actually ''could'' fly forever. GameBreaker indeed.

** Finally, the concept of having a Piranha Plant as a weapon introduced in SMBX as "Toothy". This would then be find its way to SuperMario3DWorld and ''VideoGame/MarioKart8'' in form of Potted Piranha Plant-item.

** Finally, the concept of having a Piranha Plant you can carry and use as a weapon was introduced in SMBX as "Toothy". This concept would then find it's way to SuperMario3DWorld and ''VideoGame/MarioKart8'' in form of Potted Piranha Plant-item.

** Some may think [[Franchise/TheLegendOfZelda Link's]] inclusion in the game as unnecessary and out of nowhere given it's essentially a Mario game. Then comes certain [=DLC=] for ''VideoGame/MarioKart8'' which includes Link as a driver...

* HilariousInHindsight: Some may think [[Franchise/TheLegendOfZelda Link's]] inclusion in the game as unnecessary and out of nowhere given it's essentially a Mario game. Then comes certain [=DLC=] for ''VideoGame/MarioKart8'' which includes Link as a driver...

** GREEN SPINY EGGS ARGH. green Spiny eggs CHASE YOU, and they almost always have strength in numbers because the only default Mario 3 Lakitu throws them. Thankfully, a spin jump will dispatch them.

* GameBreaker: The Hammer Suit is back from VideoGame/SuperMarioBros3, and once again can kill nearly everything. Including Thwomps, Boos, and ''Podoboos''. You can even modify the angle of the throw!
** Yoshi is back from VideoGame/SuperMarioWorld, and he's just as useful here as he was there. The original 4 colors return and are joined by new varieties, including a purple Yoshi that can GroundPound ''YoshisIsland''-style and a pink Yoshi that turns everything it eats into veggies (which it can spit back out). However, Yoshi with a blue shell (or blue Yoshi with any shell) has been nerfed, and is now merely about as flight-capable as Raccoon Mario - he can't keep gaining height forever. Considering that Raccoon Mario's flight is somewhat game-breaking in its own right, this is less severe than you might think.
*** In early versions, Yoshi with a blue shell actually ''could'' fly forever. GameBreaker indeed.

* GoddamnedBats: GREEN SPINY EGGS ARGH
** To elaborate, green Spiny eggs CHASE YOU, and they almost always have strength in numbers because the only default Mario 3 Lakitu throws them.
*** Thankfully, a spin jump will dispatch them. (Bug, maybe)?

** There's also the flying enemies coded to track you. What makes them particularly annoying is they track you in an undefined, roundabout way, making it difficult to predict where they'll come at you.

* ThatOneLevel: Hardmode Tanks. More tanks, more enemies, and MORE Birdos to defeat. They spit... fireballs. All the time. You'll need a hammer suit for this one.

*** Also qualifying is the Secret Star Exit of Dire Dire Rocks. You have to collect all ''[[UpToEleven fifteen]]'' red coins. In areas filled with Cheep Cheeps. And if you die, start the search all over again... and again... AND AGAIN...

*** Day at the Races 2 had another hidden star, and it's arguably even harder than the first Day at the Races. This star can only be accessed by playing in 2-player mode, and in this Koopa the Slow's shell race, you have to ''ride'' on a rainbow shell to get there. It's almost impossible to win, because you have to stay on the shell the ''entire time'', and if you so happen to have an accident requiring you to get off, you'll automatically lose.

** One of the game's unique features as a ''Mario'' fangame is the ability to pilot Bowser's [[FlyingCar Koopa Clown Car]], something Mario could never do in any game before, official or fanmade.

** One of the game's unique features as a ''Mario'' fangame is the ability to pilot Bowser's [[FlyingCar Koopa Clown Car]], something Mario could never do in any game before, official or fanmade. ''VideoGame/SuperMarioMaker'' probably got the idea from ''somewhere''... It's especially telling given that ''Maker'' also brings back Kuribo's Shoe, plus Nintendo themselves brought down legal action against ''Super Mario Bros. X'' years before.

** One of the game's unique features as a ''Mario'' fangame is the ability to pilot Bowser's [[FlyingCar Koopa Clown Car]], something Mario could never do in any game before, official or fanmade. ''[[VideoGame/SuperMarioMaker]]'' probably got the idea from ''somewhere''... It's especially telling given that Nintendo themselves brought down legal action against ''Super Mario Bros. X'' years before.

*** Day at the Races 2 had another hidden star, and it's arguably even harder than the first Day at the Races. This star can only be accessed by playing in 2-player mode, and in this Koopa the Slow's shell race, you have to ''ride'' on a rainbow shell to get there. It's almost impossible to win. Trying to place the door exit to the finish line so you'll win easily? Won't work. Yes, a random Layer/Event made it impossible for you to win when placed near the finish line. Yeeeesh.

* ThatOneBoss: Mother Brain in the Secret Star Exit of Pwnhammer Duece. It wouldn't be so bad if it wasn't that your ONLY weapon for the battle is a rainbow-flashing Koopa Shell, and the fact that there's blocks shooting harmful rings at you, ALL THE TIME.

* GameBreaker: The Hammer Suit is back from SuperMarioBros3, and once again can kill nearly everything. Including Thwomps, Boos, and ''Podoboos''. You can even modify the angle of the throw!

*** Also qualifying is the Secret Star Exit of Dire Dire Rocks. You have to collect all the red coins. In areas filled with Cheep Cheeps. And if you die, start the search all over again... and again... AND AGAIN...

*** Also qualifing is the Secret Star Exit of Dire Dire Rocks. You have to collect all the red coins. In areas filled with Cheep Cheeps. And if you die, start the search all over again... and again... AND AGAIN...

* GameBreaker: The Hammer Suit is back from SuperMarioBros3, and once again can kill nearly everything. Including Thwomps, Boos, and ''Poodoboos''. You can even modify the angle of the throw!
** Yoshi is back from VideoGame/SuperMarioWorld, and he's just as useful here as he was there. The original 4 colors return and are joined by new varieties, including a purple Yoshi that can GroundPound ''YoshisIsland''-style and a pink Yoshi that turns everything it eats into veggies (which it can spit back out). However, Yoshi with a blue shell (or blue Yoshi with any shell) has been nerfed, and is now merely about as flight-capable as Raccoon Mario - he can't keep gaining height forever. Considering that Raccoon Mario is game-breaking in its own right, this is less severe than you might think.

*** Also qualifing is the Secret Star Exit of Dire Dire Docks. You have to collect all the red coins. In areas filled with Cheep Cheeps. And if you die, start the search all over again... and again... AND AGAIN...
** In Return to Yoshi's Island, we get the Day at the Races levels. The first one, which is ''only the second level in the entire game'', isn't actually that bad, but that's only for the normal exit. The hidden star in this level is accessed by racing the Koopa the Slow. Sounds easy? [[note]](He's named Koopa the Slow, so he's slow)[[/note]]. Too bad it's not Koopa the Slow who's racing you. It's his shell. ''And it goes faaaassstttt''. You have to have near ''perfect'' timing on all tricky parts if want to win, plus if you DO lose, you have to kill yourself if you want to start over again.

* In Return to Yoshi's Island, we get the Day at the Races levels. The first one, which is ''only the second level in the entire game'', isn't actually that bad, but that's only for the normal exit. The hidden star in this level is accessed by racing the Koopa the Slow. Sounds easy? [[note]](He's named Koopa the Slow, so he's slow)[[/note]]. Too bad it's not Koopa the Slow who's racing you. It's his shell. ''And it goes faaaassstttt''. You have to have near ''perfect'' timing on all tricky parts if want to win, plus if you DO lose, you have to kill yourself if you want to start over again.
** Day at the Races 2 had another hidden star, and it's arguably even harder than the first Day at the Races. This star can only be accessed by playing in 2-player mode, and in this Koopa the Slow's shell race, you have to ''ride'' on a rainbow shell to get there. It's almost impossible to win. Trying to place the door exit to the finish line so you'll win easily? Won't work. Yes, a random Layer/Event made it impossible for you to win when placed near the finish line. Yeeeesh.

*** Also qualifing is the Secret Star Exit of Dire Dire Docks. You have to collect all the red coins. In areas filled with Cheep Cheeps. And if you die, start the search all over again... and again... AND AGAIN...

** The in-level items might also count, such as the Billy Gun (shoots bullets at an extremely fast pace), Toothy (a Piranha Plant in a pipe that kills enemies for you) and most of all the Super Flamethrower (which combines the Propeller Block to slow your fall and fast-moving Yoshi fireballs). However, you can't bring these out of the level they're found in.

** Yoshi is back from SuperMarioWorld, and he's just as useful here as he was there. The original 4 colors return and are joined by new varieties, including a purple Yoshi that can GroundPound ''YoshisIsland''-style and a pink Yoshi that turns everything it eats into veggies (which it can spit back out). However, Yoshi with a blue shell (or blue Yoshi with any shell) has been nerfed, and is now merely about as flight-capable as Raccoon Mario - he can't keep gaining height forever. Considering that Raccoon Mario is game-breaking in its own right, this is less severe than you might think.

*** Also qualifing is the Secret Star Exit of Dire Dire Docks. You have to collect all the red coins. In areas filled with Cheep Cheeps. And if you die, start the search all over again... and again... AND AGAIN...

** Yoshi is back from SuperMarioWorld, and he's just as useful here as he was there. The original 4 colors return and are joined by new varieties, including a purple Yoshi that can GroundPound ''YoshisIsland''-style and a pink Yoshi that turns everything it eats into veggies (which it can spit back out). However, Yoshi with a blue shell (or blue Yoshi with any shell) has been nerfed, and is now merely about as flight-capable as Raccoon Mario - he can't keep gaining height forever. Considering that Raccoon Mario is game-breaking in its own right, this is less severe than you might think.

* GameBreaker: The Hammer Suit is back from SuperMarioBros3, and once again can kill nearly everything. Including Thwomps, Boos, and ''Poodoboos''.
** Yoshi is back from SuperMarioWorld, and he's just as useful here as he was there. The original 4 colors return and are joined by new varieties, including a purple Yoshi that can GroundPound ''YoshisIsland''-style and a pink Yoshi that turns everything it eats into veggies (which it can spit back out). However, Yoshi with a blue shell (or blue Yoshi with any shell) has been nerfed, and is now merely about as flight-capable as Raccoon Mario - he can't keep gaining height forever. Considering that Raccoon Mario is game-breaking in its own right, this is less severe than you might think.
** The Tanooki Suit also appears and is identical to its [=SMB3=] incarnation. Yes, this means that you can statue-stomp ''anything'' to death.