Downloading ROMs for games you do not own is generally considered copyright infringement . The most legally sound way to use a ROM is to "dump" it yourself from a physical cartridge you already own.

: It is essential to download the latest update (e.g., version 1.05) to ensure compatibility with mods and some online features. Where to Find the ROM

Players can access "Recommended Courses" and the "100 Mario Challenge" from the Wii U version, but they cannot search for specific levels by ID.

Super Mario Maker 3DS ROM download may seem like an attractive option for fans of the game, but it's essential to consider the risks associated with downloading ROMs. While the game is no longer available for purchase on the Nintendo eShop, there are still alternative options available, such as purchasing the game or playing online. If you do decide to download the ROM, make sure to follow the guidelines outlined above to ensure a safe and enjoyable experience.

If you want a technical explanation of how 3DS game dumps work for homebrew or emulation research (strictly for legally owned copies), let me know, and I can provide that information within ethical guidelines.