Valley of Bowser 4

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Super Mario World Level
Valley of Bowser 4
Valley of Bowser 4 Level.png
Secret Exit? Yes
Level(s) # 10F, 1BF
Notes The optional fifth level of Valley of Bowser.
Star World 5
Valley of Bowser 4
Larry's Castle
Valley of Bowser 3
List of Levels
Valley of Bowser 4 as it appears from the Overworld.

Valley of Bowser 4 is chronologically the fifth level in Valley of Bowser.



Valley of Bowser 4 is an underground level. Mario must avoid stones being thrown by Diggin' Chucks, cross lava pits by jumping on grey platforms, avoid flying red Koopas, and optionally break turn blocks in order to clear the level. It also features an optional icy room where Mario must either swim and avoid the Cheep Cheeps, or must jump across blocks of ice and avoid the Spike Tops in order to return to the main level.


  • If you dare to go down the green pipe near the beginning of the level, there is a feather waiting for you.
  • After the wall of turnblocks, there is a 1-Up waiting for you... if you can break them.
  • You'll need to keep Yoshi until the very end of the level if you want to get the secret exit.

Hacking Information

  • Level 10F
    • Sublevel 1BF
  • GFX Files Used:
    • FG/BG GFX 3 (Underground 1)
      • FG1: 14
      • FG2: 17
      • FG3: 1A
      • BG: 0C
    • Sprite GFX 2 (Mushroom)
      • SP1: 00
      • SP2: 01
      • SP3: 13
      • SP4: 05
  • Level Mode 00, Horizontal Level
  • No Vertical Scroll unless Flying/Climbing/etc.
  • Music 06 'Cave Drums'
  • Time limit 0300
  • 15 Screens
  • No Layer 3
  • Sprite Buoyancy

Entrances and Exits

  • The main entrance to level 10F is on screen 00, X=1, Y=1, and S=1.
  • The main entrance to level 1BF is on screen 03, X=1, Y=C, and S=0.
  • Secondary entrance #1BF is on screen 03, X=1, Y=3, and S=1.
  • The exit to level 1BF is on screen 05.
  • The midway entrance is on screen 09.

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