I've recently been playing a game called The Hidden. It's a Half-Life mod that revolves around team work and co-operation, to take down subject 617, an experiment that has escaped. There are two teams of which you play, the SWAT team, who sport weapons such as the FN2000, P90, Remington 870, and a few more. The other team, or player, is called The Hidden, subject 617. As the hidden, your objective is to eliminate the SWAT team with your trusty, and rusty, knife. Although you are alone in your endeavors, you have a couple perks to help with your task. For one, you're partially invisible, making it very easy to sneak up on other players. If you see players in a group, making it hard for you, you have 2 grenades at your disposal. These grenades will hurt them, while also causing temporary blindness. The game is very fun, and will always bring about a few laughs. As the hidden, you can grab objects and bodies, drag them around, scare other players, and even hang them from ceilings, making the game all that more fun and engaging. I really recommend getting the game, as it is free. Although it's still in Beta stages, and the production of the mod has been greatly slowed, it is still coming along, and still very fun. Here is a video to show case it, with of course, Seananners.