OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe.OpenTTD is an open source simulation game based upon the popular Microprose game "Transport Tycoon Deluxe", written by Chris Sawyer. It attempts to mimic the original game as closely as possible while extending it with new features.OpenTTD is licensed under the GNU General Public License version 2.0. For more information, see the file COPYING included with every release and source download of the game.The list of enhancements and features compared to the original Tycoon Deluxe is too long to even begin with here.Limitations:For OpenTTD you can use the original Transport Tycoon Deluxe data files from your CD. However, there are also the free alternatives that are linked to from http://www.openttd.org/en/download-stable. Windows XP users will need SP3 installed.