10 Amazing Games That Are Actually Games Within Games

Call of Duty: Black Ops – Dead Ops Arcade

If you fancy a bit of fun as well as an extra achievement, type ‘DOA’ into the CIA computer at the title screen (once you’ve escaped your chair of course, which is a secret in of itself) and you’ll treat yourself to a hidden game called ‘Dead Ops Arcade’.

Based on Zombies, it’s a top-down arcade shooter where you clear rounds by killing zombies. Simple and addictive, it’ll also unlock you the ‘Insert Coin’ achievement.