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Mario's Keep CO-OP

Hack of Super Mario Bros.


MARIO’S KEEP CO-OP by NesDraug (and w7n) Two player hack by Corpse Grinder & Ti.

The original two player hack:


This is a puzzler. A hack which requires tricky jumps, but not totally glitch abusing skills to pass. You have to figure out the sequence of the rooms, rescue the princess and find all 9 floors.

You start with 50 lives! Remember to use A+Start on the title screen if you die. When you beat the game you will be able to choose world with the B button.

HINT: It’s not always good to be big, sometimes you might need to take a hit.


Choose the ips file to patch Super Mario Bros. (W) [!] – use Lunar IPS, WinIPS or MultiPatch or similar tools to patch.


If you would like to cheat there is a World Selector patch called “SMB Two Players Hack World Selector” Search among NesDraug’s other hacks to find it and apply it to the Mario’s Keep CO-OP nes file you’ve already created.


This hack is based on a project started by w7n. The abandoned hack featured 3 levels and the finished hack features new graphics, altered game mechanics, different music and a total of 25 levels.

This co-op version differs from the original single player version of this hack. Some of the changes were deliberate to make the game possible to finish with two players. Other changes were simply a bi product of using the two player hack (no jumping, stomping and powerups in underwater levels, no new music).

Single player version:


Main dev: Nesdraug

Special Thanks to: Eden.GT, SpiderDave for patch collection, testing and help.

Also extra credit and thanks to: w7n for starting this project.

Alo mega extra thanks and credits to: Corpse Grinder & Ti for the two player patch.

ROM / ISO Information:

  • Database match: Super Mario Bros. (World)
  • Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
  • File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
  • File CRC32: 3337EC46
  • ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
  • ROM CRC32: D445F698




ContributorType of contributionListed credit
Corpse GrinderOriginal Hacking
TiOriginal Hacking
w7nOriginal Hacking

User Review Information

Great Hack of SMB

Reviewed By: tere on 03 May 2021

Great Hack of SMB. The background is black, takes care of the player’s eyes. Unique level design. Hard.

Version 1.00 Recommended - Yes

User Reviews
Great Hack of SMBtere03 May 20211.00Yes