Instructions:Following on from a request yesterday, not sure if anyone might find this useful or not.
If you register on the Megabowl site you can put in your details for a free game of bowling. The voucher will be filled out with your details on it along with an expiry date, location etc, ready for you to print out. However, if you save the picture of the voucher to your PC, it will save will all the details blanked out allowing you to enter your new locations or expiry dates.
Hope this helps someone.