This page contains Half-Life: Sven Co-op Hints for PC - Windows called "Stadium 3: Monster revenge" and has been posted or updated on Oct 1, 2007 by maganicsterry. Let us know what you think of this Hint by thumbs voting.
Stadium 3: Monster revenge
When you kill enough aliens with the airstrike with only two people on the map at the time, the monsers will spawn out of the ring around the outer area and there will be text reading "Monster revenge".
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