Sin demo is an action game with Quake II engine which makes it provide 3D environments with 16 bit color and powerful lighting effects. It offers two single player levels and two deathmatch levels. Your character is of Col. John R. Blade whose mission is to penetrate the SinTek fortress and stop Elexis Sinclare who wants to take over the world, from executing her plans. The game has advanced enemies who can duck and cover if wounded. It has advanced weapons and much more. You can play against your friends over LAN or internet. It is revised since the original release and has lots of improvements and fixes.