Terrain

Terrain effects 1) speed and 2) vision and stealth.

How terrain effects speed:

Terrain can be either easy, moderate, or difficult to move in.

Cost to move in by running
Cost
Types
Easy 1 Energy Point Meadows (clear terrain)
Moderate 2 times as much as Easy Bushes, palm tress, top of hills, beaches (coast), Outer pine trees.
Difficult 3 times as much as Easy

Swamps, mud around swamps, rivers, hill edges, and inner pine trees.

Impossible Can't move in Lake and ocean.

How terrain effects vision:

Effect on vision
Cost
Types
Clear   Meadows (clear terrain), beaches (coast), rivers, mud around swamps, lake, and ocean.
Medium 8 times as much as Clear Bushes, palm tress, top of hills, Outer pine trees.
Difficult 16 times as much as Clear Swamps, hill edges, and inner pine trees.

Opponents only one square away are always visible.
Opponents running 2 squares away are always visible.