Extracting and Modifying NES Games from Multicarts

[Karooebzoni]

Hello, I extracted NES games from the Classic Games 500 in 1 (https://bootleggames.fandom.com/wiki/Classic_Games_500-in-1). Some of the games worked properly, while others did not. For the games that did not work, I downloaded replacement versions from the internet for some of them only, and then modified those games so they match the appearance and behavior of the games included in the original 500-in-1 Classic collection.

[Karooebzoni]

I extracted the game (Super Mario Bros 2) from (Super_Game_360-in-1)

[Fathi]

Hello, I extracted NES games from the Classic Games 500 in 1

How you do this ?

[Karooebzoni]

Hello, I extracted NES games from the Classic Games 500 in 1

How you do this ?

By (Hexadecimal)

[Karooebzoni]

Duck Hunt (no title)

[Karooebzoni]

I extracted the game (Rolling Thunder.nes) from 400-in-1 Real Game (CoolBoy)

[Karooebzoni]

​I have manually extracted a standalone ROM of "City Adventure" from the (Super 4-in-1 Fantasy Gun) multicart. It has some errors.
​Works on NintendulatorNRS emulator.

[dffn3]

Hello, I extracted NES games from the Classic Games 500 in 1

How you do this ?

By (Hexadecimal)

My method of extracting multicart uses custom script that involves reverse engineering game tables and thus converting CNROM games back to the correct registers. I've only did super 500 in 1 multicart because the romset were common on nes mini clone systems

[gmestanley]

I usually copy the entirety of the CHR ROM, search for it in the compilation with a hex editor, and do the same with the PRG ROM, but only searching for the first few bytes of the PRG ROM in case it differs. If for some reason the CHR differs as well, I do the same with it. Copy both the PRG and CHR in the multicart into a new file, and that's the extracted game. Of course, a NES header needs to be added as well.