Portal 2 now free for classroom use

Valve is providing teachers with free copies of Portal 2 as part of "Steam for Schools."

Valve's Leslie Redd and Yasser Malaika announced the news today at the Games for Change conference. By signing up with the beta, educators can acquire the game and its newly launched Perpetual Testing Initiative. Students won't be able to share custom levels outside of the classroom.

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[Kotaku]