Mechanics: 
Screen Scrolling Pipes - Hammer Brother
Sprites bouncing on noteblocks - Erik
SMM Keys and Key Door - LX5, Ampersam
Drop Items Below Player - Nowieso

Blocks:
One Way blocks - HammerBrother
Various ON/OFF blocks - ASMagicianMaks
Donut Lift - Davros, Mikeyk




Tools:
Addmusick
Asar
Blockreator
GPS
YYCHR
Pixi
UberASM
Flips


Sprites:
Bumpty - Romi, RussianMan
Koopa + Shell Disassembly - KKevinM
Multi Bounce shell - KKevinM
SMM2 Bombs - Westslasher02
Mushroom Disassembly - Russianman
Falling Icicle - The Drink
Sprite Offsetter - Koopster


Music:

Smw desert - Pinci
Luna Ascension - Crispy

Patches:
Sa-1 patch - VitorVilela
Walljump Patch - lolcats439
Retry Patch - Kevin
Extended Extended overworld names - Smallhacker and Alcaro
Better Bobombs - Sonikku
MM2 style goal - wiiqwertyuiop
Item Release Bulk Patch - Betalogic
Popful Mail background - Icycal



Graphics:
Jump 1/2 mario sprite solid blocks - Isocitration, Koopster
SMM2 On/Off blocks, SMM2 SMW spike - Ralshi02
SMM2 16x16 oneways - Westslasher02
SMM2 Donut - Hammerer
Clear Pipes - Bourgyman
Lack of Color out in Space Background - James Webb Space Telescope
NSMBW styled ice tileset - Reghrhe


