The game is truly a labour of love, created by Monolith Productions, the makers of nolf2 and f.e.a.r. I played it from 10am to midnight on the day i got it. The game is MASSIVE, it takes a long time to complete, so you really get value for money. The cutscenes and funny conversations between guards and just the overall attention to detail make this game a must in any fps gamer's collection. Even if you don't usually play fps, play this, there are no monsters like doom of farcry which is good. There is also a lot of replay value, since you are graded in each level on your your finesse, and are awarded bonuses accordingly. The game is really well balanced difficulty-wise. I started off playing it on the hard setting, and the game has yielded a really satisfying challenge, with a lot of variation throughout.