The Neurax Worm expansion for humanity eradicating strategy title Plague Inc. [$0.99], a game we really liked a lot when it hit back in May, has now become available via a free App Store update.

We detailed the new expansion last month, and it introduces a new type of plague to unleash upon the world called the Neurax Worm. It buries itself within a host’s brain and can do all sorts of nasty damage, including forcing the host to fly to the country of your choosing to spread the plague further.

The Neurax Worm offers a new set of branching skill trees to unlock and utilize in an effort to infect every last human and prevent the discovery of a cure. It’ll take a whole new set of strategies to be effective, and like the other plague variations in the game, Neurax Worm is a real challenge to infect all of humanity with.

The Neurax Worm expansion is free to those who have beaten Plague Inc. on Brutal difficulty using all the previous plague types, or if you’re not a gaming superhero like that you can just unlock and play it for a 99¢ in-app purchase.

  • drloony

    Beating the whole game is a massive undertaking, guess if I want this I'll have to pay. They have given a few new plauge type updates for beating on normal, so I got those free, shouldn't really complain.

  • Flare_TM

     I like this incentive to beat the game on a harder setting, other games should offer this alternative to their IAPs

    • James Vaughan

      Its great how supportive people have been about it - I wanted to keep the challenge of the game whilst still letting as many people as possible access the new content

  • Ako Si Amiel

    i had beaten the game at brutal mode at all plagues.. (got lucky for the bio-weapon)

    but the "special plagues" like this is not unlock although i can already play the 3 cheat modes..
    a little help please?

    • scwatergirl

      What Ako said! I've beaten everything twice everything is unlocked except for the worm!

      • Nicholas Lcfc Dale

        Same problem for me, except nothing is unlocked! And Ive beaten everything and nothing has been unlocked!

  • scwatergirl

    What Ako said! I've beaten everything twice everything is unlocked except for the worm!

  • Matthew Carette

    Um this free worm thing is total bs i can't even get the cheats unless i beat the worm which is still locked so you must get the full version