Whether you're an invisible, homicidal science experiment gone wrong, or its intrepid hunter, you're in for a scary, good time.
In The Hidden, a squad of elite, highly armed soldiers is tasked with taking down the unseeable menace. Outfitted with just a knife, the target of the hunt is also incredibly fast, and acrobatic enough to join Cirque du Soleil.
As one of the elite soldiers, your goal is to stick with your squad and use your tools and keen perception to eliminate "The Hidden." As the hunted, you want to taunt and attract the squad members to isolated locations, pounce on them for the kill, and then pin them to the wall with your knife as a warning. Yeah, that's pretty messed up.
Required game: Half-Life 2