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Night Of A Million Zombies

Zombie survival map made by Mister Dan and uploaded here with his permission. I am just a reuploader so don't thank me :D

Kill as many Zombies as possible.
There are several check points in the game for how many zombies you have killed.
This map was made in 2004 for Half-Life 2 so you don't need any games to play it.

Map should be under the "other" tab. The map is named noamz.

And since so many people have been asking about zombies not spawning: You might have to wait a little bit and run around the map if they're not spawning. Make sure you don't have disable thinking or ignore players settings on.

First video from VenturianTale and Second video from PandoraGamingInc.