The Engineer class builds structures to support their team, such as sentry guns to defend key points, ammunition dispensers and teleporters.Spies also possess the ability to feign death, allowing them to use their backstab ability more effectively. The Spy is equipped with a knife to kill enemy players in one hit by stabbing them in the back, a tranquilizer gun to slow down opponents and a hallucination grenade which spouts gas to confuse them. The Spy class differs significantly in style from other classes, as he can disguise himself to look like any other class on either side.Pyros also carry several napalm grenades for the same purpose. The Pyro class is equipped with a flamethrower and an incendiary rocket launcher, both of which can set enemies on fire.However, the Heavy is significantly slower than the other classes. The Heavy Weapons class is armed with a powerful minigun, and can sustain more damage than any other class.The Medic class is equipped with a super nail gun, concussion grenades and a medical kit that can be used either to heal teammates or expose opponents to a contagious infection that drains health.The original models for the nine player classes. The Demoman class is armed with a grenade launcher for indirect fire onto enemy positions, and a Pipe Bomb launcher for booby trapping places as well as being equipped with a demolition pack capable of opening or closing certain routes on some levels.Soldiers can also make use of nail bombs to cause more damage within close quarters. Rocket jumping, while effective for moving about the battlefield, also significantly damages the soldier.

The Soldier class is significantly slower than Snipers and Scouts, but possesses better armor and is armed with a rocket launcher that allows him to rocket jump, along with combat shotguns as sidearms for backup.The Sniper class is armed with a high-powered sniper rifle, and can be used to attack enemies from distant positions.He can also disarm the Demoman's detonation pack as well as reveal enemy spies by running close by fellow players. The Scout is armed with a nailgun as well as being able to use caltrops and concussion grenades to slow down and confuse opponents. The Scout is the fastest class in the game, but is unable to deal much damage in return.Civilians are typically escorted and protected by the rest of the team. In Escort game modes, a player may also choose to play as the Civilian class, which is armed only with an umbrella, no armor, and very little health. Finally, each player carries grenades the effects of grenades vary, depending on the player's class. Additionally, each class gets a melee weapon (all classes but the Medic, Spy and Engineer wield a crowbar, a homage to Valve's game Half-Life). Each class comes equipped with at least one weapon unique to that class, and often a secondary weapon which may be common across multiple classes (typically a shotgun or nailgun). In Team Fortress Classic, the player can choose to play as one of nine classes: the Scout, Sniper, Soldier, Demoman, Medic, Heavy Weapons Guy, Pyro, Spy, or Engineer.

In Team Fortress Classic, a server can hold up to 32 players simultaneously, and matches can be played in a number of game modes, each featuring different objectives. The class-system also encourages players to vary their selection of classes and utilize certain classes in conjunction with one another to gain the advantage. This differentiation between classes makes for rock-paper-scissors-esque gameplay that requires teammates to work together in order to effectively achieve the objective. Each character class has a set of weapons and abilities unique to that specific class. Matches in Team Fortress Classic feature two teams, one red and one blue, and nine playable character classes. In the capture the flag map ' 2fort', short for '2 Fortresses', a group of blue players attack the red base.

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