Dead Ops Arcade 2 is a Hidden mode in Call of Duty: Black Ops 3, which first appeared in Call of Duty: Black Ops. While playing this 2D game you’ll face countless waves of zombies.
Watching the Dead Ops Arcade 2 cut-scene unlocks the “Silverback in Black” Trophy/achievement. Here is how you’ll Unlock the Dead Ops Arcade 2 in Call of Duty: Black Ops 3.
Dead Ops Arcade 2 unlock guide
Once you complete the Main Story “Mission 2: New World” you’ll get access to the Safehouse. Go to Main Menu -> Open Campaign -> Go to the SafeHouse. In Safehouse look for Data Vault (a large terminal) and press the secret button located in the top left corner of the screen. Once you click on the button you’ll start the secret Dead Ops Arcade Mode 2.