Note: This game technically is possible to play it without the need to play the prequel since the first levels are easy enough to let you understand the mechanics but I don't recommend it because of the story. The first Portal game is just 1 hour long (yes, it's super short to be true) so buy the bundle one to not miss anything (and is super cheap both games when is at discount).

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One of the most anticipated sequels back then in 2011! It comes with the same simple but efective portal mechanic from its prequel with very nice tweaks and additions like the introduction of gels. Thankfully the single campaign has more content in comparison of the 1-hour long prequel, taking more of 12 hours long! So the game is even worth buy it at full price!

The dialogs & the posters are very hilarious and clever dialogs during the course of all the game (enough proof that during the first day I had almost 20 screenshots in my computer that gave me little lazyness to upload all of them to my Steam profile). More importantly they add crucial clues about the laboratory's background and about the personnel back then (there is a comic named "Lab Rat" included in the game, I recommend you to read after playing the prequel).

The best thing of the game for me is without doubt the co-op courses, unlike the single mode puzzles, they are hard and gives an awesome satisfaction completing them (even my brother and me end hugging like the bots after completing the levels). Storywise the co-op mode is after the events of the single mode but is nothing related so you can freely first start the co-op without get spoiled! Also the online connection between both players is AWESOME! Unlike most of the online game, here there is not a single lag moment during the levels (there sometime little slowdown during the load times but you know, is better that than DURING your game solving).

Last but no least, there is the community maps so with enough storage there is enough content to keep playing!