Stronghold Crusader II is a real-time strategy video game, developed by Firefly Studios, part of the Stronghold series. It was released on September 23, 2014. It is the sequel to their 2002 title Stronghold: Crusader. The first gameplay demo was given to journalists at E3 2013 and the first gameplay trailer, showing pre-alpha footage, was released at Gamescom 2013. Both the demo and trailer showed off several new aspects that the game will introduce to the series. The game is the first of the Crusader series to feature a 3D graphics engine, but will not retain all of the elements of the original 2D game while adding new features such as "new units like the cruel Slave Driver, new beefed up AI opponents, dynamic on-map events like the Locust Swarm", as well as "new visuals, a new battle interface, and engine enhancements including effects, animations, and real-time physics." A brand new feature to the series is co-op multiplayer, in which 2 players take control of a single castle to share units and resources while fighting against common enemies. Crusader II will feature both a Crusader and Arabic historical single player campaign at launch. The game will mainly be based around skirmish gameplay, similar to the original Stronghold Crusader title. This will include, as with the original Stronghold Crusader, skirmish trails; in which players need to fight through linked skirmish maps with different set-ups in a particular order. The game is expected to be based more on warfare with little but substantial government.