When patching advanced ROM hacks like Radical Red v4.1 , the patcher needs to know exactly which bytes are at which location in the original file. Using a non-1636 ROM (such as European versions or modified versions) will result in a failed patch and a broken game. Why You Need This Specific ROM for Radical Red

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: Most high-profile hacks, including Pokémon Radical Red and Pokémon Unbound , were built specifically using this version as their foundation.