Hidden Source

This guide is from a LAN that has ended, so information might be irrelevant and/or incorrect

Installation

Download and install Source SDK Base 2007 on Steam from Library > Tools
Download and install Hidden: Source
1. Connect to the file server and go to the Hidden Source directory in the Games directory
2. Copy HSB4b-full.exe to a temporary location on your computer
3. Double click HSB4b-full.exe
4. Follow the installation wizard
5. Restart Steam once the installer has finished
6. Delete HSB4b-full.exe
Search for LAN Servers for the game using the Steam Server Browser

A team of marines must hunt and kill "the hidden", a nearly invisible science experiment gone wrong, who can melee kill almost instantly.

You can jump, pounce and stick to walls by pressing middle mouse
Stay away from bright lights as it will make you easy to see
Right click when near a marine to pig stick them (loud and messy)
Throw pipe bombs to disperse tight knit groups
You can feed on corpses to regain health by pressing primary fire
Feeding causes the corpse to thrash about, so do it when alone
You cannot feed on gibbed corpses (caused by pipe bombs and pig sticking)
You can pick up objects by pressing the use key near them
You can pin corpses for feeding upon later or to freak people out, by picking up the body and pressing the secondary fire key near a wall or ceiling
You can see marines' health by holding the C key when stationary