Whilst most terrain features will fall neatly into one category, many will not. A hill may feature an impassable cliff on one side; a wooden fence may run through a forest, and so on.

Whenever a terrain feature combines two terrain categories, the players should agree upon how to deal with it before the game starts. In most cases, this will be quite simple. If one side of a hill is a steep cliff, for example, it can be agreed that, on that side, the hill counts as impassable terrain.