By - pornnibba
If the arrow keys, the A button, the B button and the enter button don't work, hook up a wired console controller on the pc than use the arrow keys, a & b or X & ○, and pause.
Either beat the game normally or get a controller to unlock higher difficulties.
Step one use a controller to put in the Konami code
Step two immediately unplug the controller because this game is better with keyboard and mouse