All one has to do to unlock Call of Duty Mobile's Zombies mode is reach level 5 through playing the rest of the game normally. Once that's done, players are free to play the mode as much as they want while it's available.

Exo Zombies is a downloadable game mode in Call of Duty: Advanced Warfare. This mode is available in each DLC pack. Exo Zombies is very similar to the Zombies game mode in Treyarch's Call of Duty games. 1-4 players (online) or 1-2 players (local play) must survive countless rounds against zombie hordes.

Call of Duty on Steam. Welcome to Call of Duty HQ, the home of Call of Duty: Modern Warfare III, Call of Duty: Modern Warfare II and Warzone!".

An Intel Core i5-2500 CPU is required at a minimum to run Call of Duty: Modern Warfare. However, the developers recommend a CPU greater or equal to an Intel Core i7-6700 to play the game. Provided that you have at least an AMD Radeon R9 380 graphics card you can play the game.