Z3M3:Absolute One-Way Paths

This is a list of paths in Super Metroid that can only be taken in one direction, regardless of items. This ignores permanent grey doors. In the context of a door randomizer where helping players avoid softlocking is important, one-way paths complicate matters for the logic.

One-way traversal through rooms

• Crateria Super Room
  • Bottom door to top door
• Green Pirates Shaft
  • Top door to any of the following
    • Mid-right door
    • Bottom left door
    • Bottom right door
• West Ocean
  • All paths with a combination of
    • Origin door among the following
      • Top right door
      • Lower top right door (connected to top left door of Bowling Alley
      • Door to Bowling Alley Path
    • End door among the following
      • Left door
      • Entrance to Wrecked Ship
      • Door to Gravity Suit Room (assuming it's not grey)
• Green Brinstar Main Shaft / Etecoon Room (technically the same room)
  • All paths with a combination of
    • Origin door among the following
      • Top Etecoon room door
      • Bottom Etecoon room door
    • End door among the following
      • Left-most door to Etecoon Energy Tank Room
      • Door to Etecoon Room (assuming it's not grey)
      • Door to Dachora Room
      • Door to Green Brinstar Fireflea Room
      • Door to Save room
      • Door to Brinstar Pre-Map Room
      • Door to Early Supers Room
      • Elevator to Crateria
• Etecoon Energy Tank Room
  • Top left door or top right door TO bottom left door or bottom right door
• Big Pink
  • Door from bottom of Pink Brinstar Power Bomb Room, to any other door in the room
• Pink Brinstar Power Bomb Room
  • Top door to bottom door
• Spore Spawn Room
  • Bottom door to top door
    • Explanation: It's not possible to kill Spore Spawn when coming in from the top door, so the first traversal is absolutely one-way
• Spore Spawn Super Room
  • Top door to bottom door
• Single Chamber
  • Door from Three Musketeers' Room to any other door in the room
• Ice Beam Gate Room
  • Door from Ice Beam Tutorial Room to any other room
• Crocomire Speedway
  • Left-most door to any other door
    • Note: Not an absolute one-way path in vanilla, but depends on adjacent rooms to be possible. Can be absolute one-way with randomized doors
• Crocomire's Room
  • Top door to left door
    • Explanation: It's not possible to kill Crocomire when coming in from the left door, so the first traversal is absolutely one-way
• Mickey Mouse Room
  • Right door to left door
• Lower Norfair Spring Ball Maze Room
  • From left door or door from Lower Norfair Fireflea Room to top right door
• Lower Norfair Escape Power Bomb Room
  • Top door to left door
• Acid Statue Room
  • Top door to bottom door
    • Explanation: It can be traversed backwards, but not the first time
• Golden Torizo's Room
  • Left door to right door
• Bowling Alley
  • Door from West Ocean corridor to Gravity Suit Room door
• Pants Room
  • Bottom left door or center left door TO right door or center right door
• Botwoon Quicksand Room
  • Top left or top right TO bottom left or bottom right (there is a morph passage in the middle)
• West Aqueduct Quicksand Room
  • Top to bottom
• East Aqueduct Quicksand Room
  • Top to bottom
• Plasma Beach Quicksand Room
  • Top to bottom
• East Sand Hole
  • Top to bottom
• West Sand Hole
  • Top to bottom

One-way traversal through rooms unless a reverse GGG is done

• East Tunnel
  • Top right door to left tunnel door or right tunnel door
• Caterpillar Room
  • Exit from Red Fish Room to any other door or elevator in the room
• Crocomire Escape
  • Right door to left door

One-way traversal through rooms unless a regular GGG is done

• Fast Ripper Room
  • Left door to right door
• Crab Tunnel
  • Left door to right door
• Grapple Tutorial Room 3
  • Left door to right door

One-way exits out of a room via quicksand

• Botwoon Energy Tank Room
  • Left sand exit
  • Right sand exit
• Botwoon Quicksand Room
  • Left sand exit
  • Right sand exit
• Aqueduct
  • Left sand exit
  • Right sand exit
• West Aqueduct Quicksand Room
  • Only sand exit
• East Aqueduct Quicksand Room
  • Only sand exit
• West Sand Hole
  • Only sand exit
• East Sand Hole
  • Only sand exit
• Bug Sand Hole
  • Only sand exit

One-way entrances into a room via quicksand

• Botwoon Quicksand Room
  • Left sand entrance
  • Right sand entrance
• Below Botwoon Energy Tank
  • Left sand entrance
  • Right sand entrance
• West Aqueduct Quicksand Room
  • Only sand entrance
• East Aqueduct Quicksand Room
  • Only sand entrance
• West Sand Hole
  • Only sand entrance
• East Sand Hole
  • Only sand entrance
• West Sand Hall
  • Only sand entrance
• East Sand Hall
  • Only sand entrance
• Butterfly Room
  • Only sand entrance