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DooM E1M1 with Turrets v2

DooM E1M1: Hangar, with actual DooM level and textures.
Difficulty: Ultra Violence.
Now optionally supports Razer Hydra and SIXENSE DLC.

This is no test chamber. You're on Phobos, and must fight your way past hell's army of turrets, armed only with a portal gun. Based on iD software's DooM (shareware version), featuring the actual level, textures, music and sounds. This level is pure turret combat. The exit room shows a scoreboard that counts kills and secrets.

Level 2 (with much more enemies, puzzles, and features) is here: http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=74456680
Wolfenstein 3D is here: http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=77625885

Remember: Portals can't be placed on metal, switches, computer screens, rough surfaces, black and dark brown metalic surfaces, liquids, or walls which aren't high enough for a portal to fit.

Update: Made turrets coloured, added a 3D skybox, removed Cave Johnson, made turrets at the end face inwards (like in DooM), fixed scoreboard.

Note! This level, textures, and sounds, come from the free (and open source) shareware game by iD Software. But you can buy the full registered version of the original game on steam here: http://store.steampowered.com/app/2280/