In this chapter, you will learn how the terrain can affect the movement of your units. An example of this could be a boat or ship unit that can’t move on land, or a tank that, in most cases, could not move on water. There are some tanks that can actually move across rivers, and you may decide that in your game you want certain unit types to move on different terrain types, which they might not be able to do in real life. You are the game’s creator, and it is your decision to configure your game as you see fit. Of course, if you are making a historical game, this would not be a good idea, but if you are making an unusual or science fiction game, you have more freedom to break the rules.