The phrase refers to versions of the classic Nintendo game playable on networks or devices where access to standard gaming websites is restricted. This often occurs in schools or workplaces. A user might seek such versions to bypass content filters.
The popularity of this type of accessibility stems from the enduring appeal of the original platformer. The games offer a nostalgic experience and a brief respite from routine. Circumventing restrictions, however, may violate institutional policies or network security protocols.