This game is amazing, especially if you are in to puzzle based games. But its not the friendly puzzle games that start to get boring and frustrating after a while, it is action packed. You have to work out what to do to stop turrets from shooting you, dont fall in to hazardous toxic water, dodge smashing plates, spikes, lasers and more. at first it is a bit slow to get in to but that is because its explaining a bit of what happened in the first game, just giving some background info. Yes ok, this game can get a bit frustrating when it takes you a while to figure out a puzzle, you get this with all puzzle games. But when you do, you feel accomplished. This puzzle game is a bit harder than most as its with portals, you need to think outside of the box, or just think with portals. The end is mind-blowing though and it introduces the two testers you can play as in co op with your friends. I really do reccomend this game and it kept me interested and occupied and im not even the type of person who likes puzzle based games. But if you are one of those people who cant stand puzzle games, even though it has quite a bit of action, i will not recomend it for you.