According to Liliputing, Portal will be offered free through September 20 on Steam. As reviewed on a recent article, Portal is playable on a netbook with a discrete graphics card, or if you tweak the Source engine so much so that it renders at the quality of the original Half-Life.
Portal is a one-of-a-kind puzzle game that requires you to use portals to teleport your character to different parts of the maps such that you can reach the exit. It is mind-boggling at times, but after a while, you’ll learn the in-and-outs of how portals work and then the game gets extremely addictive.
Screenshot: Paul Blaudschun
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