Portal 2
The original Portal was just another idea that Valve had that piggybacked off of the Half-Life engine. The team was interested in playing with in-game gravity and different types of “weaponry.” Instead of adding the portal gun into Half-Life 2, the team decided to play around and make a small standalone game with it. This divulged into Portal 2 as we know it today, the comedic, confusing, and aesthetically pleasing fun-engine that is significantly further developed than its predecessor, but it’s still munchable and high-action like other Valve titles.
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