Super Mario Galaxy Daredevil Mode is a difficulty hack for Super Mario Galaxy that forces you to beat the game under Daredevil conditions. It can be played legally on any homebrew-enabled Wii or Wii U console. No backup images or hardware modifications are required. I'd like to thank Lego Mario for providing translations in Spanish, French and Italian.
There's also a version for Super Mario Galaxy 2 which can be found here.
In order to play this mod on real hardware, you need a Wii or Wii U console, a Super Mario Galaxy game disk, the Homebrew Channel with Riivolution v1.06 installed on your console and an SD card.