Terrain Mode is an important and unique part of the design. The player can purchase tiles in real-time, which modify the map. How you build it is up to you, terrain building is an integral part of your strategy. You can create ramps leading up or down, walls, and special tiles which do things like slowing down movement or obstructing vision.
The player is forbidden from making inaccessible terrain, and can easily “paint” many tiles by holding down the left mouse button. If you make a loop it will autofill the interior. Players are restricted to modifying terrain on their part of the map.
The system is quick and easy to use, allowing the player to toggle between normal and terrain modes by clicking the middle mouse button, as well as rotating ramps using the middle mouse button.