Nintendo is famously aggressive about copyright. While the Internet Archive operates legally under (preservation), New Super Mario Bros. 2 is arguably not abandoned. You can still buy a used cartridge for $15, or Nintendo could re-release it on Switch Online tomorrow.
The walkthroughs cover alternate exits in Ghost Houses and castles that unlock secret paths. Other "Mario 2" Resources new super mario bros 2 internet archive free
serves as a digital library that hosts various versions and supplementary materials for the franchise: Game ROMs & Software New SUPER MARIO BROS. 2 Special Edition (2012) : A digital backup of the European 3DS Special Edition. Super Mario Bros. 2 (1988) Nintendo is famously aggressive about copyright