Day of Defeat: Source

Day of Defeat: Source is set in World War II, specifically the European Theatre in the year 1944. Players choose to join the forces of either the United States Army or the German Wehrmacht and compete against each other in a variety of game modes. Players select from one of six classes to play as, each with its own role within the team. Player characters cannot take much damage, and in some circumstances can be killed by a single bullet, forcing players to make use of cover to stay alive. When a player character dies, that player starts a short countdown for reinforcements. When the timer runs out, the player and any friendly players killed in that time respawn into the game at their insertion point as the next wave of troops. All weapons in the game have realistic limits to their use: machine guns must be deployed to maintain accurate fire or to be reloaded, rocket launchers must be shouldered to be aimed and fired, sniper rifles are most accurate when used with the scope and grenades not "cooked off" before release may be easily fled or even thrown back by the opposition.

 The game was initially released with four maps, although later updates have introduced five new official levels and eight community produced maps supported by Valve. The game's levels are based after real battles in the Allied campaigns in Italy, Sicily and France, such as the Falaise pocket or the beach landings of Operation Shingle at Anzio, as well as entirely fictional battles. Combat can take place in several environments, such as city streets, buildings and sewers. Each online game can sustain a maximum of 32 players.

 Day of Defeat: Source, like other titles developed by Valve, tracks detailed statistics for individual players. They include the time spent playing as each class, accuracy and performance for each weapon used, flag captures, and various other details. Day of Defeat: Source also features numerous "achievements" for carrying out certain tasks, such as scoring a certain number of kills with a particular weapon or completing a round within a certain time. Many of the achievements are class-specific, providing incentive for a player to improve his or her abilities with each class evenly. Achievements unlocked and statistics from previously played games are displayed on the player's Steam Community profile page.

 There are two main game modes in Day of Defeat: Source: territorial control and detonation. In territorial control maps, players must fight for control of all strategic points on the map. The strategic points take various forms, such as a destroyed tank in a street or fields and buildings, and are designated by a flag in its vicinity, which displays the army colors of the team who controls the point. Points are captured by a certain number of team members surrounding the point, with it either capturing instantly or after a couple of seconds. Players on the other side can disrupt a capture by placing themselves within the capture area during the process or by killing the enemy players at the point. The first side to hold all the points simultaneously wins the round.

 The objective in a detonation level is to plant and detonate explosive devices on a number of enemy positions, which can consist of AA guns, tanks and armoured cars. Some positions must be hit twice for them to be completely destroyed. Players can protect their positions by defusing the explosives before they detonate. In one variation of this game mode, one side has to defend their positions for a set amount of time, with the destruction of each piece of equipment giving the enemy team more time. The defenders win if they can hold their positions long enough for the time to run out, while the attackers win when all objectives have been destroyed. In the alternate version, both teams must attack the other's objectives while defending their own. The first team to destroy all of the enemy's equipment wins.

 Day of Defeat: Source is still considered a active game. With a diehard fan base still gains over a few thousand people playing every day. For a game that will be ten years old this year, that is a very good number.