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The Hidden

This gamemode is a remake of the game "The Hidden: Source". In this gamemode, one player plays as "The Hidden", a genetically modified human with enhanced physical abilities... oh, and they're invisible. The rest of the players have to work together to try and defeat the Hidden using a variety of gadgets and weapons.
This is not a single player gamemode.

This is not "The Stalker". You can read about the original Hidden game at this link:
http://www.hidden-source.com/

The gamemode is obviously not 100% true to the mod, but the differences are slim. There are some new features and some others have been removed.

Facepunch link (usually more up-to-date):
http://facepunch.com/showthread.php?t=1463483&p=47643865#post47643865

GitHub (I recommend downloading this instead of the workshop addon, you can use the config file this way.):
https://github.com/Fortune117/thehidden (Gamemode)
https://github.com/Fortune117/hiddencontent (Content Pack)

If you'd like more information on what the gamemode is, go to the facepunch link.

If you need any help, post on my steam profile before adding me.

Happy hunting! :D