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Cave Johnson here: Now this test is a bit different. We are currently under attack by Black Mesa, so get those turrets down that hole ASAP, they will be sent into battle to defend aperture. Once thats done, feel free to play deadly portal tag with. Just pop a portal behind those red lazer walls and under your friend and BOOM, hes it.

PS: One of those buttons does something bad, so dont press it; yes that one right there, right over there, see it? DO NOT press it!!!!!!!!!!!!!!