Counter-Strike: Source also implements physics objects, such as filing cabinets, which the user can interact with while playing. The smoke grenades in Counter-Strike: Source spread much more slowly than the ones in Counter-Strike, and the flashbangs, which now utilize DirectX 9 effects, have a much more pronounced effect, and bounce very differently from the ones in Counter-Strike. Several elements of the gameplay were modified from their Counter-Strike iteration, such as the behavior of the grenades, the physics engine, and the weapons' recoil. The amount of damage done by a bullet varies dramatically depending upon the body part the bullet hits, with great emphasis on shooting the enemy in the head, which is almost invariably lethal. Recoil can be difficult for beginning players to compensate for because the player's reticle does not correspond with where the bullets actually hit during continuous fire, so beginning players may aim too high during automatic fire. Shooting while moving dramatically decreases accuracy, and holding the mouse button down to continuously shoot will generally produce severe recoil.

Moving and shooting also differs noticeably from many other first-person shooters. When playing on a server without modifications, if players are defeated during a round, they do not respawn until the next round, unlike in many other first-person shooter games, where players respawn on a set timer. Some winning conditions include defusing a bomb, planting a bomb and preventing it from being defused by the other team, rescuing all the hostages on a map, preventing the hostages from being rescued, and defeat all the members of the opposing team. There are many types of objectives that a map can have, but the ultimate goal of the game is to win more rounds than the opposing team, which is accomplished by fulfilling the map's winning conditions. The aim of playing a map is to accomplish a map's objective. Counter-Strike: Source is a remake of Counter-Strike, and consequently retains its team-based objective-oriented first-person shooter style gameplay.

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