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Add an Engineer, new Resource cards and Weapons, and Monster Siege Engines in Castle Panic.
The Engineer will build 7 different Weapons, depending on the Resource cards you supply.
In addition to Brick and Mortar, you now have Rope and Wood to expand your Weapons capability.
The Monsters won't know what hit them when you build Springs, Traps, Barricades, Catapults, and Ballistas to take them down.
Now the Monsters are building Siege Engines, like a Battering Ram and War Wagon, to destroy your Castle.