Portal undoubtedly came out of nowhere and shattered the mold, but Portal 2 took that raw and incredible concept and managed to shape it into a more polished and impressive package. It cranked the dials up on just about everything that made the original so special. The mind-bending puzzles, the surprisingly dark story, and the ridiculous humor that balanced it out – each piece of that picture was refined and refreshed to build a sequel that actually surpassed the ambition of an already extremely ambitious game, making something both familiar and altogether new.
It gave us a deeper look into the wonderful world of Aperture Science without completely dragging all of its mysteries out into the light. It also mixed its “thinking with portals” puzzles up even further by weaving in gel mechanics that felt entirely fresh and completely natural at the same time – while simultaneously and subtly using them to tie gameplay mechanics into the story, patiently waiting until its incredible finale to pay off those setups with one of the weirdest and most spectacular video game endings around. Couple that with a seriously good co-op campaign and even a full-on custom level builder and sharing systems added post-launch and Portal 2 has stayed the high bar by which all first-person puzzle games should be measured, even nearly a decade later.