To use cheat codes in GenPlusDroid (a Sega Genesis/Mega Drive emulator for Android), you generally need a

Many Genesis emulators, including the core logic behind GenPlusDroid, use files for patch/cheat data. .cht files: Some variations or related cores use

Folder: cheats/

GenPlusDroid typically looks for a directory named /genplus/ on your device's root or SD card. Inside this folder, it automatically creates a cheats subdirectory to store and load your code files.