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[[http://www.openttd.org/en/|OpenTTD]] is an open source simulation game based upon Transport Tycoon Deluxe. Can use the Transport Tycoon Deluxe data files or a replacement set ([[http://www.openttd.org/en/download-opengfx|OpenGFX]] for graphics, [[http://www.openttd.org/en/download-opensfx|OpenSFX]] for sound effects, [[http://www.openttd.org/en/download-openmsx|OpenMSX]] for music).