Heretic Wii is a Wii port of Heretic based in the open source HHeretic 0.2 engine.
1. Extract the .zip directly into your apps folder
2. Copy heretic.wad into sd:/apps/HHeretic/heretic.wad
3. Launch the game using your loader.
4. NOTE: HHeretic needs space in the SD to write files during the game.