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The Escape

It has been a day since you and your friend ecsaped Nova Prospekt in a chopper you stole. Coincidentaly, a headcrab canister was on it's way, and it shot down your helicopter. Luckly, you survived, but your friend did not. Now that you are well rested, you must make your way to the rebel camp through a quarantine. Combine, zombies, and puzzles await you on your short journey. Good Luck!
Start inside the building that is next to the black building with a white roof. Start with no weapons, as you will get them on your way. This requires NO addons or games.