Simply just put the freezrburn folder into your saves folder

Ex:  C:\Documents and Settings\yourCPUname\Application Data\.minecraft\saves

This map and game mode idea is free to everyone to do as they wish, whether it be to carry out the game mode and make something great out of it, or simply just for idea making.

Credit:
Notch: creator of Minecraft
HudCraft: Texture pack used in screenshots