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The Orange Box: Portal Hints
Section 4: More Turret Ambushes and the Final Showdown
1 of 9: Right after this section loads, you'll find yourself at another toxic corner.
3 of 9: Walking around in the sludge doesn't do you any good, so portal on up to the higher floor and deal with the massive turret ambush that's up there waiting for you.
9 of 9: After the computer's red core is destroyed, you can just sit back and watch the ending video and credits, which include a weird little song that's sung by the computer. Creepy!