Megaman 2 Negative Daydream (NES) Romhack

A simple, unfinished experiment that was repurposed into a boss rush, with the main gimmick being that most of the colors are inverted. This hack includes:

Boss-centered gameplay
Higher difficulty
Free E-Tanks from starting a new game or continuing from a game over
Faster heads-up displays for both the Robot Masters and Mega Man
New color palettes
Modified Robot Master ASM
Modified weapons
Modified weaknesses
A few sprite changes

Update (3/9/26): I have decided to abandon this hack after YouTuber NARFNra introduced me to a Japanese wiki that lists hacking notes for Rockman 2; twice as many notes as Data Crystal, in fact. As such, I will work on a hack called Rockman 2 Maboroshi no Sho (The Phantom Chapter). Stay tuned!

Hashes:

Filename: Mega Man 2 (USA).nes
CRC-32: 80e08660
SHA-1: 54d53b46b961ba8b80ef57309bb0d78995d740a2

Staff/Credits:

* PineTools for helping me determine the hack's colors using the color inverter tool; I used this tool alongside an image of the NES' color palette: https://pinetools.com/invert-color

* Yum0987654321 for archiving this hack; if I remember correctly, they also suggested the hack being a boss rush due to the strong focus on Robot Masters

* Ramon Rocha for his easy-to-use Mega Man 2 rom editor that saved me a lot of time: https://megaman2customizerwebapp.azurewebsites.net/editor

* Nali for part of Air Man's ASM (2 tornado patterns only)

* Mega Man 2's original staff for the base game

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.