The Heavy Wall is an upgrade of the Medium Wall, and is available in Tech Level 3. It has twice as many hit points, giving players increased protection. Like the Medium Wall, it costs 5 Ore per unit, and players can build Gates to let their units pass through.

In Tech Level 4, it can be upgraded to the Shield Wall at the Research Center for 400 Carbon and 200 Ore. Unlike Turrets, Walls and Gates do not change appearance when upgraded.

"At Tech Level 3, your Medium Walls may be upgraded to Heavy Walls, which are much tougher and are almost impervious to damage, except from Heavy Weapons specifically designed to destroy them."
—Manual description

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