Paper Mario Master Quest Jr is a fan-made modification (mod) of the original Paper Mario game released for the Nintendo 64. Created as a companion to the notoriously difficult Master Quest mod, the Jr edition serves a specific purpose: it bridges the gap between the accessible base game and the brutal difficulty of the standard Master Quest.
You will need a clean, unmodified copy of the base game. The patch specifically requires the ROM, and the file should be in the .z64 format. paper mario master quest jr rom download