Call to Power II (called CTP2 for short) is a PC turn-based strategy game released by Activision as a sequel to Civilization: Call to Power, which was, in turn, a game similar to the Civilization computer game by Sid Meier. The game could not have "Civilization" in its title because the word is trademarked by the makers of the original Civilization series. In October 2003, Activision released the source code, enabling the Apolyton gaming community to debug, improve, and add new features. Its makers seem to have lost interest in it. It is not mentioned on their website, August 2010.