How to play: Each game uses different controls, most DOS games use the keyboard arrows. Some will use the mouse. Description: Portal for DOS. Play free online games at Armor Games! We're the best online games website, featuring shooting games, puzzle games, strategy games, war Portal Games. 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.