Terrain Types

It costs 2 squares for each 1 square moved.

You can shift into difficult terrain, but it provokes opportunity attacks.

As difficult terrain, plus you must pass a Balance check for every move action begun in the area, and upon entering the area (DC dictated by the effect: default 15). If you fail, you fall prone.

As difficult terrain, but you must pass a Strength check for every move action begun in the area, and upon entering the area (DC dictated by the effect: default 15) in order to move at all. If you pass, you move at half speed, and if you fail, the move is canceled.

You cannot enter the terrain square on foot. However, you may climb on it using a Climb speed or the Climb skill. You may fly over the square.

Terrain squares which cannot possibly be entered by any means are "inaccessible", whether on foot, by climbing, or flying. It may yet be possible to traverse these squares while incorporeal.