Portal 2 offers a continuation to the first Portal's fantastic story and gameplay with the addition of new mechanics and characters that keep the game fresh and a blast to play for the nearly 9-hour main storyline. The whole game features master level design with every mechanic being thoroughly explained and utilized throughout the story. Solving every puzzle is rewarding and nothing feels like it's up to chance, only you and your wit can find the solution. If I could give this game 2 thumbs up I would, It's my favorite game of all time and a true gaming masterpiece.