The best game ever made by Valve. Great story, beautiful dialogues with funny jokes, interesting puzzles, perfect atmosphere and a lot of fun in co-op with friends. You made a great work, Valve, and thank You for this absolute masterpiece.
10/10.

Portal 2 is the sequel to Portal and adds more puzzles and more fun.
At the beginning of Portal 2, Chell is awakened in a “long-term relaxation chamber” in Aperature Science by a little hilarious, British personality named Wheatley. Wheatley's goal is to help you escape, however you soon find out that GLaDOS is still alive. Chell is once again forced to use her portal gun to navigate the ruins of the facility and deal with the resurrected GLaDOS. The story takes some very interesting twists and turns along the way and the terrific dark humor of the first game remains intact.
The gameplay from the original game returns in all of its mind-bending glory. Players use the portal gun to shoot blue and orange colored portal holes onto walls to traverse over deadly pits, transport Weighted Storage Cubes to switches to open doors and lower elevators and redirect lasers. Additions to the gameplay include the propulsion and repulsion gels which do pretty much as they describe, either sliding the player off at great speed or sending them bouncing high into the air. In addition, players must redirect light bridges and conveyer beams with portals as well.
One of the most exciting new features in Portal 2 is the inclusion of co-op gameplay.
Co-op gameplay gets its own storyline and characters, Aperture Science robots ATLAS and P-Body, each armed with their own portal gun and even more challenging puzzles for the gamers to solve. You can either play with a friend (split-screen or online) or team up with a random player.
I highly recommend Portal 2 to anyone who is looking for a good fun game that will take up a few hours and even make you think instead of the average First Person Shooter.
Overall, Portal 2 is a masterpiece and definitely worth the money.

Sounds 10/10
Graphics 10/10
Gameplay 10/10
Atmosphere 10/10

One of the most brilliant games ever made. The gameplay, humor, characters, and wittiness are astonishing. The co-op was some of the most fun I ever had. Do yourself a favor and get this AND the first Portal if you haven't already.

Personal Rating: "Classic - Must buy"
Traditional Rating: 9.5/10
Platform: PC
Genre: First Person Puzzle Adventure

While the first Portal was a simple yet totally addictive and wildly funny concept game released as part of the Orange Box, Valve knew it had a winner on its hands. When the Orange Box released most of the talk centered around Portal and it immediately became the favorite of the entire compilation for many and went on to win many Game of the Year awards in 2007.

With the accolades rolling in yet again there was never any doubt that Valve would not produce a sequel but that it would produce a sequel that could never match the brilliance of the original game. Somehow, in some strange alternate dimension to the rest of the game development world, not only did Valve deliver the sequel but they enhanced the concept in every single way (much like Valve did with Half-Life 2 that many thought could not possibly match the brilliance of the original Half-Life)

Portal 2 rightfully won stacks of Game of the Year accolades in 2011 including the BAFTA for Best Game. No mean feat by any standards except for the good folk at Valve. Once again the mute Chell returns with the evil super computer GlaDOS and her cynical jibes that illicit more than just belly-laughs this time around as she continues to push Chell through increasingly more difficult tests that seem alarmingly designed to kill and mame.

Chell has some help this time around in the form of another Robot named Wheatley - brilliantly voiced by Stephen Merchant with absolute perfect comedic timing. Once again the stage is set for yet another showdown...or is it? With a script that is as sharp as a tack and containing a level of comedy often associated with a Pixar film, Portal 2 more than rises to the challenge. Once again the puzzles or tests included start off deceptively easy before reaching a level of head-scratching confoundment towards the end. There is enough content here to give the old grey matter a good workout.

However, its not in the single player that the game really shines as one would have expected (although it is brilliantly good) - the real meat of the package and the reason everyone should own this title is simply for its amazing co-op. This is without a doubt the most ingenious and side-splittingly funny co-op implementations yet and still remains to be beaten. Giving each player a robot with portal guns of their own both players must help the other navigate the various test chambers GlaDOS has assembled. Working your way towards a solution often results in hilarious mishaps with incredibly funny running commentary from GlaDOS. Its an absolute winner! With added Steam Workshop support you have a title that could live on and on forever since apparently Valve are very adverse to the number 3 in numerics.

While many doubted a full game could be fleshed out of the original Portal concept not only did Valve deliver on that promise it also delivered one of the finest games of this generation. If you haven't played this yet...what on earth are you possibly waiting for!

Portal is back and better than ever! The tests are as mind bending as ever, and they've added new elements, like light bridges and emancipation gates. The graphics are smooth and attractive, but nothing that's going to make your jaw drop. The controls are as simple and effective as the first game. But then, none of that was what worried me. I had no doubt that they would be able to recreate and expand upon the technical aspects of the first game.

My concern was whether or not they would manage to capture and continue the personality and sense of humor of the first game. I am very pleased to report that the sequel does not disappoint. The sequel pics up right where the first game left off, and GLaDOS holds a grudge. Her insults, passive aggressive comments, and general malice will have you chuckling throughout the game. Your new companion and guide robot also adds to the character of the game, though he can be a bit heavy handed at times.

If you enjoyed the first game, you will love the sequel, both for its expanded challenges, and its unique personality. As long as you enjoy a good puzzle and have a sense of humor, you will never regret this purchase.