Super Mario Bros.: The Lost Levels · walkthrough
World B
Second letter world. Same unlock caveats as A. Previous and next stage links sit under each area.
World B-1
Flagpole. World B-1.
How to progress
- Letter worlds are extra after the numbered game. FDS-style unlock: eight 8-4 clears (title-screen stars), then hold A and press Start. PixelQuest has not independently verified that combination on Nintendo Classics.
- All-Stars: A–D can follow 8-4 or 9-4 automatically. Deluxe omits A–D. Do not mix those rules.
- Play these stages only if your listing actually offers them. If NSO does not show A after 8-4, the world is not missing from this walkthrough — it is version-gated.
Hazards that matter
- Poison mushrooms
- pits
Notes
- FDS A+Start after eight stars vs All-Stars sequential vs Deluxe omitted. NSO listing not independently verified.
World B-2
Clear B-2.
How to progress
- B-2 continues the extra-hard SMB2J layout. Poison, pits, Piranhas.
- Flagpole or exit pipe.
- Same 8-bit poison warning.
Hazards that matter
- Piranha Plants
- pits
World B-3
Athletic / special B-3.
How to progress
- B-3 athletic. Wind and springs likely.
- Flagpole.
- Luigi vs Mario as before.
Hazards that matter
- Wind
- pits
World B-4
Castle B-4. Impostor or Bowser depending on version notes.
How to progress
- B-4 castle. Axe.
- Impostor likely. Toad or continuation to the next letter, version-dependent.
- If your copy returns to the title, you are done. If it continues, play the next letter world.
Hazards that matter
- Fire-bars
- lava