A fliped disco shell(board) that you can ride (...Or can just get "pushed" by it depend method because why not? :P) and you can get nice X-speed boost jump when you take off from the shell(board) depends it's kicked speed. ("Kicked speed = Player's X-speed", when you interact with it basically.)
You cannot stop it normally once you kicked, except some cases...
Also, It never "die" from stuffs in normal ways either. (Again, exception exists too... Like "Sprite kill block" and lava etc.)
Based upon "Koopas + Shells + Disco Shell" by KevinM heavily, so please give big credits to him! :)
And special thanks to JamesD28 for give tips about kill/ride routines!
Without his help, I would still really struggle with about both routines no doubt. :D
Also, certains some customizable options too! (Check asm file for more info.)
(Pretty much required to patch "Player X Speed Fix" or something like that if you want full advantage of X-speed boost when you take off from kicked shell properly. It is due to one glitch that make you not able to jump properly at all when your X-speed exceeds on "certain" point.)
[Update log] v1.1: Fixed small quirk when you trying to cape spin on the shell(board) if "!SpinBoostTimer = $00". v1.11: Added "!InterruptNoInteractTime" option which let you set the timer for disable contact on player when shell(board) got interrupt by anything.
v1.2 : Rewrote ride routine completely so riding is now way more less janky now.
(Also, added some minor visual effect. :P)
v1.21 : Merged old/new method into one file, and added two options about insta-glide from shell(board). (Also fixed cape interaction stuffs too!)
v1.22 : Fixed a bit more so you can ride on shell(board) properly during goal sequence after touched goal tape/orb. (Only applied if "!RidingMethod" value is 0, which is default now.)
v1.3 : Revised "!RidingMethod = 1" to something more interesting than before... Check out! :) (Special thanks to JamesD28 for help me figure this properly.)