Brutal Mario Wiki
Brutal Mario Wiki

Deep Sea Research
Mario swimming in the darkness


World 3: Bay.


★★☆☆☆ (2/5, Easy-Normal)

Secret Exit?:


Previous Level:

Dolphin Barbecue

Next Level:

Ocean Palace

Stage Gimmicks:

The screen keeps going dark, collect rainbow colored jellyfish to expand visibility.


Blurp, Urchin, Jelectro, Cheep Cheep, Rip Van Fish.

Power-Ups & Items:

Super Mushroom, Fire Flower.


Demo 6, Demo 6.5, Demo 7

Deep Sea Research is the second level of World 3. An underwater stage with a screen darkening gimmick, and filled with a large amount of jellyfish.

Level overview[]

Begin the stage by following the set path, dodging the enemies along the way. Be careful for Jelectros hidden behind the darkness. You'll soon find a rainbow-colored jellyfish. Collect it to restore Mario's sight. 

Keep proceeding right, dodging Jelectros along the way. Look for an opening in the floor and collect the two rainbow jellyfishes you come across. Head right still, and you'll come across a field of Jelectros. Proceed carefully to catch the rainbow jellyfish, while still dodging the Jelectros. 

After a few screens of this, you'll find the goal. 

Dragon Coins[]

  1. At the first fork, go through the lower path.
  2. At a dead end, just after the first one.
  3. In the Jelectro field.
  4. A few screens away from the last, also surrounded by Jelectros.
  5. Near the end of the Jelectro field.

Asset Sources[]


For graphics, this stage uses the cave foreground from Super Mario World 2: Yoshi's Island, and the underwater background from Donkey Kong Country.

The Jelectros use their sprites from the All-Stars version of Super Mario Bros. 3.

The rainbow jellyfish's sprites seem to be original.


The music used in this level is Boundaries from Romancing SaGa 3.


Japanese version English version English patch
しんかいちょうさ (Shinkai Chousa) (TBD) Deep Sea Adventure
Translation: Deep Sea Research