Love your mobile phone, but wish it had a little more old school action? The kind you played on the Nintendo when you were eight? And better yet, do you wish it was free?

If you said yes to all of the above, you're incredibly demanding. But also, your wish has been granted.

To celebrate the game's latest update (which added a Boss Rush mode, ranking system, and character skill system), Contra: Evolution is available for free until Thursday. .