9 Awesome Hidden Modes In Popular Video Games You Totally Missed

9. Pitfall, H.E.R.O, River Raid & Kaboom - Call Of Duty: Black Ops II

It's easy to forget when they're still one of the most recognisable contemporary video game companies in the world, but Activision have one hell of a past, chock-full of iconic titles.

To that end, in Call of Duty: Black Ops II, developers Treyarch decided to pay tribute to a handful of their classics, including an emulated Atari 2600 packed with Pitfall, Hero, River Raid and Kaboom. Each one is from the halcyon days of the 80s when video games were barely more than a handful of pixels, but you can sit and play through all four if you so desire (H.E.R.O in particular is pretty badass).

To unlock them, simply shoot off the heads of all the mannequins within two minutes on the Nuketown map, and the television already in the centre of the level will change to an Activision logo. Dive in!