Portal is probably the greatest addition to an already bursting package of games (Valve’s Orange Box). Though it only takes about 2-3 hours to “solve,” it has more unique and clever ideas sewn into that time than any other game I’ve played in recent memory.
Even if were just 19 floor-separated challenges, it would still be pretty amazing. However, it manages to build to a satisfying finale with the instantly memorable voice-work being of particular note. If you’re not familiar with it, the video below explains it better than I could hope to without filling up the front page.