On GMod? GMod is like an universal collection of different games fitted in one game. There are tons of different playable game-modes, some are good and some are not. It all depends what you like. There are very good game-modes, like Trouble in Terrorist Town. I'm sure you have heard of it. Basically, one player is a traitor to the terrorists, and others are innocent. When the game chooses a traitor, it chooses a detective as well, who tries to uncover who the traitor is. If you are a traitor, nobody will know unless you show it by killing someone. You leave clues, however, when you kill someone, like what weapon you've used or who the victim saw last. Other than that game-mode there are many other game-modes, but I haven't played many. There is a one I played a lot, but I forgot it's name. It's basically a life simulator. Each player has their own room in the hotel, and you can make parties in this room and even watch TV. Watching TV was my favorite. I'd invite my buddy in the room and we'd watch youtube videos or even movies like the Monty Python and the Holy Grail. It's a good game and you can get it really cheap at a Steam sale. It's a must-have.