Unlock Upgrade Cards for Traps and Weapons for Orcs Must Die 3

Unlock Upgrade Cards for Traps and Weapons

In order to get perfect runs on the Story mode levels, it is essential that you get your hands on the advanced upgrades, which add special modifiers to your traps and weapons. These include things like increasing the damage to the secondary fire or adding elemental damage. To unlock these upgrade cards requires completing the challenges that can be found on the upgrade page for each trap or weapon. Simply look at the progress bar and read the short description to find out what the challenge is. Most of them are straight forward and simple, with some you will be able to complete naturally during the course of play.