Pro Sandbox Mode and Multiverse (multiplayer and level editor)
Remember, it's not just levels! In the Sandbox you can test your machines which is neat. The Multiverse has a lot to offer as well: the multiplayer function and the Level Editor. You can upload your levels to the Steam Workshop (Steam only).
Pro Encourages creativity
In each level, the player is given an objective. The objective can be reached in any way. Players are able to build a huge variety of custom weapons and vehicles. Potential vehicles include airplanes and helicopters, tanks, catapults, hot air balloons, and more.