A fan mod prequel to Valve’s Portal 2, Portal: Revolution, has released a trailer, and it teases the kinds of puzzles fans might expect. You can watch the trailer, which was posted on YouTube, below.

Portal Reloaded co-op is here, as the astounding Portal 2 mod that introduces a time travel portal to the Valve puzzle game gets an update years down the line. While Portal 3 feels as far off as a ...