Kongregate free online game Portal: The Flash Version - Based on Valve's latest hit, Portal: The Flash Version brings it all up in 2d! Portal: The. We're the best online games website, featuring shooting games, puzzle games, strategy games, war games, and much Free Games Online. →. Portal Games. Portal: The Flash Version: A flash version of a real PC game. Includes over 40 challenging levels, with almost every feature the real game has. Fun and addictive.