A common software mod for the wii. By use of a glitch in "Zelda: Twilight Princess," you can play unauthorized homebrew software and illegal copies or backups of wii and gamecube games without having to install a modchip. It also enables you to play games from other regions (ie Japanese games on a US Wii).
Because the hack requires loading a hacked save file, a Wii, a copy of "Zelda: Twilight Princess", and an SD card are required. And it requires a GENUINE copy of the game for WII, no gamecube or pirated versions.
This *does* void the warranty, but only *if* Nintendo finds out.
"Whoa, how'd you play that Japanese game on your American Wii without installing a mod chip?"
"I used the Twilight Hack. Go look it up on Urban Dictionary."