Legally, creating a backup ROM of a game you physically own is generally considered permissible under the concept of "fair use" or archival purposes in many regions. If you own a physical copy of Chrono Trigger for the DS, downloading a digital backup via a QR code for personal use is often viewed as ethically acceptable within the modding community.

Today, if you type into a search engine, you are met with thousands of results. Forums, Reddit threads, and ROM-hosting sites promise a simple path: scan a QR code with your Android or iOS device, and instantly download the game to play on a Nintendo DS emulator.

: Chrono Trigger DS is famous for its anti-piracy measures , such as a "time warp" glitch that traps players in an infinite loop at the start of the game. Many ROMs found via random QR codes may not have the necessary patches to bypass this. How to install ds games directly to 3DS homescreen