Ok guys complete the first three campaign missions, unlock the safehouse.
Access the Data Vault in the safehouse, press on the top left square for some old skool dead ops arcade 2, earn them achievements/trophy's.
It's a cool mode, with mini games at certain levels such as a micro machines style racer where you're running over zombies. ☺😂😄
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Thanks for the info on how to unlock DOA2. I'm gonna have to try that when I can get back on. I loved how crazy the first one in the original Black Ops was.