Super Mario Bros. 3X is a Romhack made by the SMWCentral user Koyuki. It blends the gameplay of Super Mario World with the graphics and feel of Super Mario Bros. 3.
This game provides examples of:
- Big Boo's Haunt: The Ghost Houses in Giant Island and Yoshi's island.
- Bat Out of Hell: The Swoopers; there is a level in Bowser's Land dedicated to them called Swooper Cave.
- Battleship Raid: Wendy's Battleship, Roy's Ship, Bowser's Land 3, Bowser's Land 4 and Crappy Ship.
- Breath Weapon: Mini Rhinos, Fire Chomps and Venus Fire Traps. There's even a blue variant of the Venus Fire Trap that can rapid-firespit their fireballs.
- Convection, Schmonvection: Lemmy's Castle is frozen over, yet the ice does not melt when it is placed next to the lava pits in said castle. Magma Castle qualifies because it is a tribute to Super Mario Bros. 3.
- Cranium Ride: Parabeetles and Bowling Goonies.
- Fan Sequel: To Super Mario Bros. 3.
- Fungus Humongous: The Sky 5 and Yoshi's Island 3, which combines it with Underground Level.
- It's All Upstairs From Here: The Switch Tower in Bowser's Land.
- Game Mod: Of Super Mario World.
- The Goomba: Shy Guys and Goombas.
- Invincible Minor Minion: Firebars, Podoboos, Rotodiscs, Tap-taps, Bumpties and Chain Chomps.
- Lava Is Boiling Kool-Aid: In Bowser's Land 4, Mario must press P-Switches to turn the lava into swimmable water.
- Magic Wand: The Magikoopas and a few of the Koopa Kids.
- Mutually Exclusive Power-Ups: Fire Flower and Raccoon Leaf.
- Night of the Living Mooks: Dry Bones, Boos, Bony Beetles and Fishbones.
- One-Hit Kill: Boss Bass and the Giant Chomps in Yoshi's Island 3.
- Ring-Out Boss: Fake Bowser, Bowser and Big Bully.
- Rise to the Challenge: Seaside 4 because of Boss Bass.
- Storming the Castle: Except in Seaside and The Sky.
- The Spiny: Spiny, Buzzy Beetle, Spike Tops, Wild Piranha Plants, Boss Bass and Bony Beetles.
- Took a Level in Badass: The Angry Sun is back, but you can't use any of your tricks in Super Mario Bros. 3 to beat him.
- Transformation Trinket: Super Mushroom, Fire Flower and Super Leaf.
- Unique Enemy: The Moai in Desert World 4, the Rex in Yoshi's Island 1, Giant Chomps in Yoshi's Island 3, Wiggler in Yoshi's Island 5
- Wrap Around: ??? Castle and the Ghost House in Yoshi's Island.