E3 2010: Portal 2 E3 Demo - Thermal Discouragement Beams (Part 4)

Part four of the Portal 2 E3 demo series shows off a new gameplay tool: Thermal Discouragement Beams. The bad news is this new puzzle element can be hazardous to your health. The good news is they're even more hazardous to the health of turrets.

By Video Staff (Jun 30, 2010)