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This gametype is included in A Boojum Snark's Team Fortress 2 Gametype Library
The complete entity setup for this gametype is included in "A Boojum Snark's Team Fortress 2 Gametype Library," a downloadable VMF that includes all official Team Fortress 2 gametypes. The entities can easily be transferred from the VMF to your own custom map without the hassle of having to build it yourself or debugging it.
"A Boojum Snark's Team Fortress 2 Gametype Library" can be downloaded here: TF2Maps.net
