Of Guards and Thieves or OGAT as its commonly referred to is a surprisingly goofy game with various game modes from steal the loot to survive a zombie horde. Each being played by someone around the globe. There is even a soccer ball mode (Football for everyone else from around the globe.)
In the stealing mode you are either the thief or the guards the thieves goal is to steal a object casually laying around the office or wherever it is being held and the objects are normally in value only to gamers. Such as the cake from Portal 2, the Dovakins helmet, Pizza, and well you get the idea its all gamer related goodies.
Horde more with zombies you are either a zombie or you are once again the guards fighting for your survival if you are a zombie you got to eat the guards and if you are a guard you got to kill the zombie its pretty strait forward.
As far as early access games go this one is hilariously fun to play with alone or with friends and I recommend it to anyone interested in Team Fortress 2, Portal, anything made by Valve.
Or simply anyone with a good sense of humor that are casual gaming nerds all the way.