Super Mario Bros.: The Lost Levels

Game: Super Mario Bros.: The Lost Levels → (NES / Famicom, 1986)

A static recompilation of the Japanese Famicom Disk System Super Mario Bros. 2, known outside Japan as The Lost Levels, with the cycle-accurate backend of nesrecomp, the author’s own framework. It’s the first Famicom Disk System game made with that framework: the real FDS BIOS runs, so you see the Nintendo boot screen and the disk load as on the console, and every program file on the disk is compiled ahead of time at its load address; code the game builds in RAM during play goes through an interpreter. It has a disk button to check the drive or reinsert the disk, and saves to a separate folder without ever writing to your image. As an optional, experimental mod it has widescreen (fit to window, 16:9, 21:9, or 32:9). An October pass entered, with assistance, all 54 regular areas of worlds 1–8 and A–D and the four World 9 areas, matching the interpreter’s pictures; it’s not an unassisted full playthrough. Version 0.0.3 (October 19) is for 64-bit Windows. 8 of its 13 commits list Claude as a co-author.

You needYour own Super Mario Bros. 2 (Japan) (Debug Value 0).fds disk image (SHA-1 3b8c8998b4887d6dd676965943d69a320738ab9c) and the Famicom Disk System RAM Adapter BIOS (8,192 bytes, CRC32 5E607DCF, often named disksys.rom). Plus 64-bit Windows.

How it gets to PC

Static recompilation

Console

Nintendo Entertainment System / Famicom

Architecture

6502

Author

mstan

Original studio

Nintendo R&D4

Year

1986

Stars

4

Last activity

2026-10-19 · 12 days ago

Latest version

v0.0.3 · 2026-10-19

Language

C

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