Great Circus Mystery Widerscreen (Genesis) Romhack

version 1.1
changelog:

- fixed crash after losing all lives in 2 player mode

This game, like many multiplatform games of the 90s that appeared on both Genesis and SNES, runs in H32 mode, or 256 pixel width (which is the SNES width). Genesis games can also run in H40, 320 pixel width, and they usually do. This hack makes the game run the gameplay scenes in H40, or 320 pixel width.

This took a huge amount of reverse engineering. The things I needed to do were:

turn ON H40 mode at the beginning of gameplay (injection)
turn ON H32 mode at the end of gameplay (lost all lives, beat the boss, end of attract mode demo)
change the tiles to load in earlier when scrolling
change the sprites to load in earlier when scrolling

Enjoy!

bankbank

Hashes:

Filename: Great Circus Mystery Starring Mickey & Minnie, The (USA).md
CRC-32: 14744883
SHA-1: f2df9807fe2659e8f8e6ea43b2031a6abd980873

YouTube Video:

File download:

Help about patching:

Most of the files you're about to download need to be applied to your game. Here is a list of utilities that allow you to do this:

Online Patcher: Marc Roblero's online patcher. Works with many different file types.
Floating IPS: NWell-known patcher for applying IPS and BPS files.
Delta Patcher: Used to apply xDelta files.
More Patchers

On most files, you can also press “Patch It”, to apply the patch without downloading the file.