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Development:Pokémon Red and Blue

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This page details development materials of Pokémon Red and Blue.

How about a nice leek in this trying time?
This page or section details content from the April 2020 Nintendo Leak.
Check the April 2020 Nintendo Leak category for more pages also sourced from this material.
To do:
Everything notable from the source code leak. EVERYTHING. And with filepaths.

In April 2020, a leaked copy of the source code of Pokémon Blue was released on the internet in osrc.zip (password: poke1024). The source code was found to contain a sea of pre-release material detailing the development of Generation I.


Backsprites and data for unused Pokémon.
Early title screen graphics, scrapped trainers, and more!
Unused Maps
The world of Capsule Monsters looked rather different from the world of Pokémon.
Pokemon RGB-Pokeball.png
Pokémon Data
Changes to the Pokémon data.
Pokemon RGB-PaperSheet.png
Miscellaneous Data
Various changes to various bits of data.
Pokemon RGB-Pokedex.png
I'm a boy scout. I've got a girl friend!
Scrapped music and sounds, some of which would later be used in Gen II.
Unused Code
Rainbow City!