I know I'm 1 month late to point this out (better than never, though), but I'm mildly amused that Nintendo officially implemented 8-player Split-screen Local Multiplayer for their first time ever since Mario Kart 8 Deluxe's Switch 2 Update! The fact that 8-player Smash Bros officially exists since 2015 (arguably since 2019 due-to Sm4sh severely limiting their 8-player feature in contrast to Ultimate) goes to show me even furthermore that 8-player Co-op NSMB needs to become Nintendo-official at some point, just like they did implement 24 Racers Simultaneously in Mario Kart about six years later than MrBean35000vr unofficially pulled it off in Mario Kart Wii.

How did you make this? As someone who wants to become a coder, I'm very interested in the science behind this.

Could you pls make all levels with 8 players

what is this mod called and where can i find this?

Whaaaa!?, there skip? 0:35