Very easy to do. Just plug in a second controller and control both controllers by yourself. The left hand controls the controller that uses the left analog and the right does the right analog. You can beat the same level 10 times to unlock. Easiest level is the first Worcestershire stage. It has 4 or 5 babies and they are all right in the open.
You can also have a friend or family member help but it might be easier by yourself.