Lambda Fortress

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Lambda Fortress may refer to many different TF2 Sourcemods that aim to make the TF2 classes fully playable for co-op across Half-Life 2 and other Source campaigns.

Lambda Fortress (Nicknine): The first iteration of the Lambda Fortress mod created by Nicknine.
Lambda Fortress: Extended: The second iteration of the Lambda Fortress mod that was forked off of Nicknine's Lambda Fortress with various additions.
Lambda Fortress (CoaXioN): The current iteration of the Lambda Fortress mod, being developed by CoaXioN, built off an early version of Lambda Fortress: Extended that aims to fix the issues the mod had and bring it up to modern standards.

Although not currently referred to as Lambda Fortress, Fortress Connected (originally Lambda Fortress: Community Edition) is another mod that was originally built off of Lambda Fortress: Extended, focussing on more custom mashup-style content.