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Try disabling or uninstalling other custom campaigns since they can overwrite each others' files.
You must first grab the gravity gun in one of the buildings and go through the buildings in sequence.
Or if you already did that, then just force them open with GMod powers.
Getting gravity gun felt like a powertrip.
Encountered 0 performance issues with around 80 addons. I havent used any ai changing addons except better sandbox npcs and strider improvemnts though. (Honestly, why the hell would you even use them on campaign maps? Its not intended for balancing and usually destroys performance.)
Only complaint: short.
8/10
Don't forget to purchase and mount Half-Life 2 Episodes 1 & 2.