"Team Fortress 2" is a multiplayer computer game developed by Valve Corporation and released in 2007. Though there is technically no single player mode, you can still modify the settings in a way that allows you to play offline. The only way to trick the game into playing offline is to reserve all but one of the slots in the lobby for bot players. Remember to leave the one slot open, since you need to reserve your own place.
Instructions
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1
Load "Team Fortress 2" to the main menu.
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2
Select "Create Game."
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3
Change the number of reserved slots to one less than the total number of slots. By default, you create a game with 12 slots, so change the number of reserved slots to 11.
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4
Select "Start" to begin the game.
