OMG... Well in the olden days (for about 90% of classic FPS players) Team Fortress means TFC, or Team Fortress Classic, a pre-Counter-Strike teamplay mod for Half-Life that shipped with the game from patch version 1.0.0.6 or so... it emphasised class-based play and had some truly genius maps... and it was also ludicrously fun and yet included a level of tactics that rivalled Counter-Strike. It wasn't until Counter-Strike reached its 1.2 patch level that it started to kill of TFC, and you can still find players today. Add it to your Steam games list. Now. Or else.