Super Mario Castle World

 is a game released on the Nintendo Ultra-64. It was known as Super Mario 64 IOTL.

Story
"Please come to the castle. I’ve baked a cake for you."

At the invitation of Princess Peach, Mario (along with Luigi) enters the Mushroom Castle.

Upon entering the castle, Mario and Luigi discover that no one is there. According to Toad, some maniacial Toad has stolen the Power Stars guarding the castle and locked Princess Peach into the walls and paintings due to jealousy & power hunger. That mysterious Toad goes by the name of Fungüse!

Now it’s up to the Mario Bros. to rescue Princess Peach and their friends from the castle’s paintings and walls!

Gameplay
The gameplay is identical to regular Super Mario 64, except this time, Mario and Luigi are here. Mario plays the same, except his punches and kicks are more powerful. On the other hand, Luigi has his trademark higher jump.

Friendly NPCs

 * Peach: Princess of the Mushroom Kingdom She was locked away within an unknown location of her own castle by Funguse. Appears at the grounds after the final battle.
 * Toads: Friendly NPCs that hang around and give tips.
 * Daisy: Princess of Sarsaland. She too was locked away by Funguse in a trap that he set that led to the Fire Sea. Found in the mirror room after the final battle.
 * Bob-omb Buddies: Red peaceful Bob-ombs born without a fuse. One of them hangs around in certain levels to open up a cannon.
 * Koopa the Quick: A large and friendly Koopa Troopa that loves to challenge people to a race. Beating him grants a Power Star.
 * Hoot the Owl: An owl that resides in certain trees. Can carry the player for a limited time.
 * Penguins: Residents of Cool Cool Mountain. One of them challenges others to race for a Power Star. Another lost her baby. Bring the right one and you get a Power Star.
 * Snowmen: One is small and got his head and body separated. Another is the size of a mountain. Both have Power Stars.
 * MIPS: Peach's pet rabbit who runs down the halls. Catch him to get a Power Star.
 * Dorrie: The friendly Plesiosaur from Super Mario World. Steer him and ground pound his back to climb on his head.
 * Ukikis: Grab these monkeys and the player loses their cap, which makes certain friendly NPCs hostile due to being unable to recognize Mario or Luigi without the cap. Grab them again and the cap is returned. One of them has a Power Star.
 * Yoshi: The friend above the castle. Get 120 stars first.

Courses
Same as IOTL, the hub world is Princess Peach’s castle. So here’s a list of courses to go through.

Section 1

 * Bob-Omb Battlefield - Same as OTL
 * Whomp’s Fortress - Same as OTL
 * Jolly Roger Bay - Same as OTL
 * Goomba Woods - A forest course filled with Goombas, Goombrats, Galoombas, and Goombuds. The boss of this course is the Goomba King.
 * Cool, Cool Mountain - Same as OTL
 * Motos’ Magma Temple - A course that resembles Marble Zone (Sonic the Hedgehog 1), and it includes the unused Motos enemies from OTL.
 * Bowser in the Dark World (Twelve stars are needed to go to stage) - Same as OTL, except Bowser’s tricked by Fungüse into fighting Mario (or Luigi, or both).

Section 2

 * Big Boo's Haunt - Same as OTL, but with some friendly Boos you need to rescue.
 * Hazy Maze Cave - Same as OTL
 * Cue Ball Chaos - A course that’s set in a pool table of all locations.
 * Lethal Lava Land - Same as OTL, except the unused Blaarg enemies from OTL are included, but some of them are friendly and you get to ride on them. Also, another difference is that there are more areas inside the volcano.
 * Shifting Sand Land- Same as OTL, but the pyramid has a bit more to explore.
 * Dire Dire Docks – Same as OTL.
 * Fiery Reptile in the Fire Sea (was known as Bowser in the Fire Sea IOTL) (Thirty stars are needed to go to stage) - Same as OTL, except the boss of this stage is Salamandragon (Half-salamander, half-dragon). Also, another difference is that before you go there, you have to fight Wario (or Waluigi if you’re Luigi) in a caged arena.

Section 3
And the rest of the courses stay the same as OTL.
 * Snowman’s Land - Same as OTL
 * Wet-Dry World - Same as OTL
 * Tall, Tall Mountain - Same as OTL
 * Tiny-Huge Island - Same as OTL but with more old-school Mario enemies like Fuzzies and Buzzy Beetles.
 * Tick Tock Clock - Same as OTL
 * Rainbow Ride - Same as OTL
 * Final Battle in the Sky (was known as Bowser in the Sky IOTL) (Seventy stars are needed to go to stage) - Same as OTL, except the boss of this stage is Powered Fungüse (which is Fungüse transformed into a Bowser-like creature).

Enemies
Coming soon!!

Bosses
Coming soon!!