Since the direct QR code is a dead end, here are the two real methods to play the game on your 3DS hardware.
To obtain the QR code for Grand Theft Auto: Chinatown Wars on the Nintendo 3DS in 2021, you can follow these steps:
Since there is no "QR code" for a direct eShop download, you must use the DS homebrew pipeline: Your 3DS must have Custom Firmware (Luma3DS).
: When played on a 3DS, the game utilizes the system's native DS hardware (TWL mode). It does not feature stereoscopic 3D but benefits from the 3DS's larger, brighter screens.