The most common is actually a forwarder . It is a small CIA file that installs a homebrew icon on your 3DS home menu. When you launch it, the system runs a piece of software called NDS-Bootstrap (a DS game loader for the 3DS) to play the game from your SD card. This is not emulation—it is near-native DS hardware compatibility.
By utilizing the power of 3DS homebrew responsibly, Mario & Luigi: Partners in Time can sit proudly on your modern home screen, offering a nostalgic, dual-screen RPG experience that holds up remarkably well today. If you want to set this up on your system, let me know: Is your 3DS already running ? mario and luigi partners in time 3ds cia