Learn With Portals -- popular game free through 9/20 - 2 views
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Bharat Battu on 16 Sep 11Portal is a fun, innovative 3D first-person game known for its unique physics gameplay and sense of humor. It's over 4 years old now, but still enjoyable and clever. It's been used in education as a way for students to explore physics, and also as a gameworld ripe for student content creation. The game is available as a free download for PC/Mac through 9/20.