Steep slopes

A slope that is too steep can cause Tertill to tumble.  For that reason Tertill turns away from any slope steeper than about 22° (40% grade).  This corresponds to two units of rise for every five units of run.  

Some crops grow best on mounds of soil but avoid building mounds with slopes greater than 22°.  Tertill may not visit the top of a mound if the angle it too large.