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The most common practical use of QR codes is for emulators, such as DeSmuME or MelonDS. Many fans create custom in-game sprites (changing the player's outfit, Pokemon colors, or UI elements). These customizations are often distributed as image files. A QR code can simply encode a to download these texture packs. Scanning the QR with a smartphone leads to a download page, and the user then manually installs the sprites into their emulator's folder. The QR code itself does not modify the game; it is just a convenient link. Pokemon Heart Gold Qr Code