No installation required. You just download, click the exe, and play. *NoCD Crack already added. *Completely portable! Saves a 54kb folder which only has a config file for your settings and your saved game. It's great if you don't like clutter on your PC. *Both XP and Vista compatible. Run as Administrator on Vista. *Around 100mb smaller than the installed version. It's not much of a reduce in size, but it's still smaller.