This game is:
15% concentrated power of will
100% reason to purchase this game
But all joking aside, This truly is a good game. It has many different game modes, you can play murder, which is like a "find out who the murderer is" scenario. You also have Prop hunt, players will be cops or something, and you can morph into certain props. Sandbox, is build whatever you want, and probably what I spend most time doing. There is a lot more, and I can go on and on, but there are so many mods I can't cover it all. The modding community is very active, and if you have problems there is usually always a person out to help you. It also has very active multiplayer, have fun with that.
I will probably be playing this game for a few years, its just so good and interesting, and a lot of funny stuff happen. It isn't a serious game, its more of a "have fun and don't care about serious stuff" game. Obviously depending on multiplayer you might have rules, but you will get past that. Have fun, 10/10 Would get murdered by ten nukes again.