This is my second pass at writing Konami code recognition and thought it would have been a good exercise for playing around with Redux. For those that aren't familiar, the sequence is: up, up, down, down, left, right, left, right, b, a, start. "a" and "b" are case insensitive and I replaced "start" with the enter key. It picks on keyup events, so just make sure the window has focus.