Scrapped Content in Super Mario Star World

Due to SKELUX experiencing several health issues, many features of Super Mario Star World have been scrapped.

Arc 2
The second arc, taken from the cancelled game Super Mario Star Road 2, which SKELUX was making before planning to incorporate its story arc into Super Mario Star World, had been announced during the summer of 2018, but he had been planning it for more than a year earlier. It is unknown how many courses there would've been in the second arc.

The second arc's final boss, SKELUX's avatar, a Chain Chomp, was planned to be quite literally the largest boss ever in any Mario game, also having the ability to teleport. It might have been the threat that was hinted at in Mario's Holiday, as one of the Signposts of Future Predictions read the following: "A new threat....The entire world, could it be in danger?". The second arc would've had two endings instead of one. Neither of them would've been good, but, rather, one would've been bad and the other would've been sad, but less bad.

These 4 side courses from Super Mario Star Road 2 might have been planned to be included in the second arc:
 * Cloudtop Citadel
 * Sound Step Seas
 * Autumn Airway
 * Breezy Boardwalk

Course 16 & 17
Course 16 was going to be a main course with a city theme, since he already finished the course model, SKELUX stated that he might add this course in an update, or add it with simpler stars. This was hinted at in Mario's Holiday, as one of the Signposts of Future Predicitons read the following: "A 16th stage....A large new world will be visited?"

Course 17 was planned to be a really creepy and haunted main course, SKELUX confirmed that this course has no chance of making it into the game.

Bowser's Forest Maze
Bowser's Forest Maze was intended to be an in-course area for Piranha Plant Pond.

Demo 2: Mario's Detour
Mario's Detour was planned to be a second demo for Super Mario Star World. This demo would have been a sequel to Mario's Holiday.

Yoshi
There was going to be a modified rideable Yoshis in the game, which would've replaced his playable role. Different colors of Yoshi were planned be in the game and would've been found in colored eggs. The way you would've obtained the various Yoshi eggs is unknown. Each colored Yoshi would've had a unique ability, similar to those from Super Mario World.

New Playable Character
There was a chance that another playable character would be appearing in Super Mario Star World, though it is unknown who they were going to be. One of the Signposts of Future Predictions from Mario's Holiday read the following: "Someone else....They look a bit like Mario, or Luigi....Who could it be?".



Costumes
Costumes for Mario to change into were going to be present in Super Mario Star World, as one of the Signposts of Future Predictions from Mario's Holiday read the following: "Costumes....Mario learns some fashion sense!" However, it is unknown if costumes could've been found and/or purchased through means other than the Shop

Shop
There was going to be an Item/Costume Shop where players could spend their coins and lives in exchange for items and costumes. The Shop is located inside of the ? block in the new hub world area but it's unknown what items it would have had for sale.



Minigames
SKELUX has stated that was planning to add in 10 new and modified unlockable minigames playable through arcade machines. These would've had themes based on the courses that they are unlocked in, such as the Chucking Competition from Chuckya Harbor.