Source:
https://rpgmaker.net/games/2975/
Creators:
GreatRedSpirit
AncientNoob
Ben_Random
bentelk
Davenport
Emirpoen
Desmo360
Decky
dell2005
Dudesoft
halibabica
LEECH
kentona
TheNecromancer
Minus
narcodis
Oloeopia
Racheal
Ratty524
ShortStar
Solitayre
UPRC
Mikemc
Faenon
Publisher:
GreatRedSpirit
Files:
Main download=Super RMN Bros. 2.7z
Shortstar Version v1.3 [Unofficial]=Super RMN Bros. 2 - Shortstar Version v1.3 [Unofficial].zip
Failure Release (GRS Edition)=Super RMN Bros. 2 - Failure Release (GRS Edition).rar
Working Release Fixed by Hali=Super RMN Bros. 2 - Working Release Fixed by Hali.zip

Description:
Super RMN Bros 2 is the sequel to the community event, Super RMN Bros. where everybody could make Mario levels and have them all placed into one single game. The weapon of choice? Super Mario Brothers X v1.3, a (now dead) PC game made to create and play Mario style levels with a mix between Mario Brothers 3 and Super Mario World physics with enemies and obstacles spanning Mario 1 to Super Mario World!

What You Need to Play Super RMN Bros 2
You need the creation tool used to make RMN Bros 2 to play it: Super Mario Brothers X v1.3 available here! Run the installer, download and place Super RMN Bros 2 into the SMBX "Worlds" folder, run SMBX and play Super RMN Bros 2!