You’ll need to get Mercenary Stronghold Keycards in MW3 Zombies to enter these formidable areas. Once you find a Stronghold key, you can explore these areas to find excellent loot and a ton of zombies. Unfortunately, the game doesn’t give you any clues as to the location of a Merc Keycard. Instead, you’re stuck finding it yourself.
Atlas is an action-rpg with rogue-like elements where you use your ability to control the ground to fight the enemies and move through procedurally generated worlds.
