Pretty typical zombie game - defend your units until the timer runs out. If all your units die, then you lose. Mix it up a little bit, there are some different hero units to be and zombies sometimes mix it up with some different units and strategies.
Player 1 - team 1 (Civ irrelevant)
Player 2 (non-existent)- team 1 (Civ irrelevant)
player 3 (Computer) - team 2 (Civ irrelevant)
player 4 (Computer) - team 1 (Civ British works best but not critical)
Download & Unzip file ->My Documents/My Games/Age of Empires 3/Scenario
Currently still in beta test phase, feedback much appreciated - be harsh, I know I am.
Game initially designed for 2 player co-op, this version has been modified for one player solo.