Commandos is a stealth-oriented real-time tactics video game series. The five games released between 1998 and 2006 are all set during World War II and follow the adventures of a fictional Allied commando unit. Each mission is loosely based on historical events during World War II to carry the plot. The series was developed by the Spanish developer Pyro Studios and published by Eidos Interactive. The series has sold a total of 3.3 million copies and generated $41 million of revenue at retail. There are five games in the series, which are listed here in the order they were released in: Commandos: Behind Enemy Lines Commandos: Behind Enemy Lines (CBEL) was released on 1 July 1998. It was published by Eidos Interactive, and developed by Pyro Studios. It features 20 missions. The view is isometric with tactical gameplay. A Sega Mega Drive/Genesis version of Commandos: Behind Enemy Lines, with the first 5 missions, was also made by Russian homebrew programmers, but lacked sound and certain other features of the PC version. Commandos: Beyond the Call of Duty, a set of new Commandos missions issued as a standalone game, was released on 31 March 1999. Despite it being much shorter than Behind Enemy Lines, it is a much more difficult game containing levels on a far greater scale to the extent of being comparable to those that were to be seen in Commandos 2. It has 8 missions, with locations including Yugoslavia and Greece. Commandos 2: Men of Courage A full sequel, released in 2001, was rebuilt with a 3D engine, more interactive environments, more skills for the commandos, and new characters. Like its predecessor, it drew heavily from war films and titled its levels in reference to such films as "The Bridge on the River Kwai" and "Saving Private Ryan". The game received even greater praise. Several new characters were added to the series in this sequel: A thief called Paul "Lupin" Toledo, a dog called Whiskey and Wilson, a shot-down pilot claiming to be from the Light Brigade.