Walking simulator that doesn't move the franchise story forward in any way. Way too expensive for what it offers, too short, (the few) new mechanics felt underused or not used to its fullest. Bosses felt unsatisfying. Got some deja-vu from the previous games which means they just recycled some gameplay segments.

The art is still flawless but every single other aspect of this game is VERY uninspiring.

Announcing paid DLC on day 1 just cements this as an effortless cash grab.

It's a small map-pack focused on a really interesting new mechanic with very solid puzzles. It is hard to master and offers a big challenge.
The visuals are not impressive, but they weren't meant to be.
There isn't much of a story, just something to fill in the silence.
It is worth playing if you want a couple of hours of nicely designed puzzles. Don't expect anything more than that.

Papers, Please.
All entrants must have a passport.
All documents must be current.
Arstotzkan citizens must have an ID card.
Foreigners require an entry permit.
Workers must have a work pass.
No weapons or contraband.
Asylum seekers must have a grant.
Entrant must have polio vaccine certificate.
Foreigners require an access permit.

Arstotzka,
Ministry of Admission.

All content was extremely filtered by a few of finest members in the Portal 2 modding community. And that includes the level design, music, modeling, animations and puzzle creation. It is the proof of what a few passionate Portal fans can acheive with hard work and dedication. It's a gift from the community to the community.

Interesting concept, the paint gun is very fun to use. Good soundtrack and workshop support.
However the weak story, and some very frustrating levels make Aperture Tag an easily forgettable experience.
If you are craving for some Portal content this will serve you well.

This game is a must if you enjoy any or most of the followings: puzzle games, great stories, fun or different game mechanics, clever or funny writing, memorable characters, eating cake.
It's a short experience that manages to introduce a lot of fun content in a very short time.
From this point onward, no puzzle game was ever the same. It proved you don't necessarily need a gun that kill things to have fun in a first person shooter.
Portal is a HUGE SUCCESS.

Portal 2 gets the absolute best of Portal and expands it in ways no one thought would be possible. It's not a game you forget after you've beaten it.
It's the best narrative in modern video games with brilliantly written dialogues, memorable characters and quotes, and some of the best voice acting ever. The story is rich and deep, done the Valve way of show don't tell.
The puzzles are satisfying to solve and well made, with amazing level design and unique visuals that make every puzzle not only a monotonous black and white room but a great space in an unknown, abandoned facility.
The music will relax you, make you alert, sweat, shake and then repeat. It will react to your actions, help you solve the puzzles in very subtle ways, and it's available for free if you buy the game. It's greatly implemented and vastly present in all game.
The co-op is even more fun and satisfying, adding another layer of puzzle solving to your game. The workshop has hundreds of thousands of user created content that offers countless hours of extra gameplay.
You can grab this game for a penny or two during sales, so there's no excuse not to have it in your Steam library yet.

Portal 2 is perfect. It's a masterpiece and I'm proud to say it's the best game I've ever played.