Wall

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When an ability creates a wall, that area is expressed as "X wall." The number X is how many squares are used to make the wall. When you place a wall, you can build it one square at a time, but each square must share at least one side (not just a corner) with another square of the wall. A creature or object must be within the area to be targeted by a wall ability.

You can stack squares on top of each other to make the wall higher. Unless otherwise stated, a wall can't be placed in occupied squares, and a wall blocks line of effect.

Source: Draw Steel: Heroes · printing 1.01b