(SD cards this small are harder to find nowadays)
It is called hackless because it does not require any modification of your Wii.
The hackless version is run by tricking the Wii into running a program from the SD card when Stage Builder is selected.
Most modded games usually have two versions you can download, a “Hackless” version and a “Homebrew” version. In this guide I will explain how to set up modded versions of Brawl like Project M and Brawl Minus, as well as how to add your own mods to those.