Now i played the first game and it was a great original game that was never done before. And to take that and make it better is a great accomplishment. The story is absolutely hilarious whether on the normal campaign or the co-op campaign the material is just top notch. I love the things gladious says and the addition of the characters are just hilarious. The puzzles are great and definatly get you to think. however if you have played the first one the first i'd say 10 seem way to familiar. only at the point where they add the lasers and light bridges and so on does it finally start become challenging. What i found at some points annoying is the constant load screens on single or co-op. the load screens are the one thing that really kills it for me. and sometimes its just ridiculous. like you'll come into a room that only requires maybe 2 minutes of game play and your at another loading screen. then the next room only takes you 3 minutes. this wouldn't bother me that much if it didn't happen so much. the loads only take on average 10 sec. maybe more however the constant need to load the next area makes it so that at some times It feels like i'm loading more than playing even though i'm really not. so my actual score would be 8.5 but it didn't have that so i chose 9 and i really think that the loading is the only reason i deduct the .5. as far as co-op games go this is a game were you constantly need to work together and can in no way make it through without the aid of the second person. this is a huge plus and an even better refreshment cause there are so many games that CLAIM to be a co-op game but in all technicality you could finish it on your own. but here you don't have that option. you have 2 portal guns which means 4 portals, in most (if not in all) situations you will have to use all 4 at one point or another in the challenge. but then once again those dern loading screens.