Cities3D is a software implementation of one of the world's greatest board games. It uses the OpenGL graphics library to display the board and game pieces in three glorious dimensions with beautiful texture mapping to make things look just like the board game you play and love. It includes the maps for the basic game as well as every Seafarers map and special rules, including 5-6 player expansions and unique variants like Jungles and Volcanoes along with the Cities and Knights expansion.