Simutrans is a cross-platform simulation game in which the player strives to run a successful transport system by constructing and managing transportation systems for passengers, mail and goods by land (rail, road, tram, monorail, maglev), air (airplanes) and water (ship) between places.

[5] Simutrans was developed internally as a closed source game until 2007,[6] when the software was relicensed under the Artistic License 1.0.

[8] Simutrans-Extended was formerly called Simutrans-Experimental, but changed its name in 2017 to make clear that it is a distinct fork of Simutrans and not a testing branch.

Simutrans currently features 12 AI players, and has an online capability similar to OpenTTD since version 110.0.

The terrain in Simutrans is freely-modifiable, and different layers like tunnels and bridges can be stacked, allowing for subways or highways to be constructed.

Since the objects in the game just consist of a simple image and a short description file, it is very easy to create a house or add a train.

Even deep modifications of the game mechanics are possible via the config file, like a setting to prevent stockpiling at factories or changing the economic model simulation.

[16] GameDaily's Big Download considered Simutrans to be one of the best freeware games, highlighting the logical system of routing passengers and freight to their destinations, decent AI opponents and the support for custom aesthetics or rules-sets.

However, the sometimes unreliable vehicle pathfinding was criticized, particularly with respect to alternate routes and switches for train lines.