You play as test subject [4-5-0-9]. Awoken from stasis by an automated AI, you are expected to perform a very special test course. Within the depths of Aperture Science, secluded from the rest of the facility, lies a previously unknown and long forgotten testing track.
In Portal Reloaded you get a hold of the Triple Portal Device, which allows you to shoot three different portals. The familiar blue and orange portals, connecting two different places in space and a third green timeportal, which connects two different timelines. Travelling between the present and a version of reality 20 years in the future, opens up a completely new way of puzzle solving.