Codes down below in the description. Unused level 15 of Super Mario Bros. 3 on the NES. An unused level that seems to have a really weird design. It's unlikely that it could've been an actual level design at one point. Possibly, it could just have been used for testing purposes. The level also apparently is supposed to have a Hammer Bro., which never spawns. If you recall, I do have the SNES version's unused levels uploaded, but in very low quality (144p), which has lead me to upload the NES version's unused levels. Subscribe to my channel for more!: / @dekkiedot Codes used: LZSLZGYX +NGSLLGSG + PTNUGGXA + VZNUIKUU + IZXUAGPX: The codes required to play this level. KKKZSPIU: Debug mode on the NES version of Super Mario Bros. 3. MY TWITTER: / dekkiedot Thanks for watching!