Valve's Portal 2 puzzle maker now supports cooperative map design.
Portal 2's Perpetual Testing Initiative — the built-in puzzle-making tools that let players create their own levels and share them via the Steam Workshop — now supports the option to make maps that can be played and solved by two players working cooperatively.
Today's Portal 2 update also includes a new "Quick Play" option, which lets players quickly access top-rated, player-created maps. Valve says that Portal 2 players have created more than 170,000 single-player puzzles since the launch of the Perpetual Testing Initiative in May.
Valve is offering existing Portal 2 owners 75 percent off the cost of a second copy, which normally runs $19.99 on Steam.