A briefing given before a mission begins is divided into two parts - the first, focuses on the background of the mission and where it takes place, and the second, using the mission's map, details the objectives the commandos must complete, any important information they need to know, and what they must use to escape the area. In the game, the player assumes the role of an allied officer, who has been entrusted to command a group of commandos on each of the game's twenty missions that they undertake. The game branched out into a series that used the same system of game mechanics, beginning with an expansion pack entitled Commandos: Beyond the Call of Duty in 1999, and later with three sequels - Commandos 2: Men of Courage in 2001, Commandos 3: Destination Berlin in 2003 and Commandos: Strike Force in 2006.

GameSpot Spain declared it Spain's biggest game hit of all time by 2002. The game proved to be a commercial success, with global sales above 1 million units. Each mission's objective varies, but ranges from sabotage, assassination or rescuing captured allied units, with players having a full view of a mission's map to plan their strategy and its execution in advance. The game sees players take control of a group of six Allied Commandos, who conduct a range of missions across wartime Europe and Africa, using small unit tactics. Commandos: Behind Enemy Lines is a 1998 real-time tactics video game developed by the Spanish company Pyro Studios and published by Eidos Interactive.

Commandos behind enemy lines passwords