Team Fortress 2 Classic was created on the Facepunch Forums in late 2014 by Danielmm8888, who ported leaked Team Fortress 2 code from 2007 to the publicly-available Source SDK, allowing himself and other community contributors to make changes to the game and add new features.

[2] It replaced earlier projects that used older builds of Team Fortress 2 directly, and couldn’t be modified to add new content.

Any game mode that disables classes/weapons to function goes against some of the core principles of Team Fortress 2.

The game was temporarily unavailable from September 2021 through June 2022, after a supposed arrangement with Valve fell through.

Compared to Team Fortress 2, the new game modes include:[6] PC Gamer’s Jonathan Bolding described it as "a remarkably well-produced mod that covers a lot of ground".