In Call of Duty: Black Ops 3, there’s a secret mini-game called Dead Ops Arcade 2 that can be unlocked after certain condition is met.
Dead Ops Arcade 2 is the sequel of the first Dead Ops Arcade found in the original Call of Duty: Black Ops. To unlock the sequel, you must get to the safehouse within the campaign’s main menu.
The very first thing that you need to do is to clear the first two missions of the campaign mode. Once it’s done, go the safehouse where you will be able to explore the Data Vault computer. Scroll through the computer and find the secret button located in the uppermost left-hand side- push it and the Dead Ops Arcade 2 mini-game will be unlocked.
The secret button somewhat looks like the number of two or one of those middle school “S” diamonds everyone always drew.
