This is a business simulation game, presented in an isometric view in 2D with graphics by Simon Foster, in which the player is in control of a transport company, and can compete against rival companies to make as much profit as possible by transporting passengers and various goods by road, rail, sea and air. The Deluxe version is an expanded and improved version of the original game.

How to play:
please check this
http://wiki.openttd.org/FAQ_gameplay