Choose your desired tickets first and add them to the cart, afterwards you will be able to modify the amount per ticket.
However, you are able to buy tickets with the same conditions without beeing required to login.
If you are buying tickets for the first time, you may register later on during the final steps of the purchasing process. With a registration, you gain the advantage to order tickets more quickly and easily within our online shop in future.
Should you have taken the opportunity and created a user account before, you may login with your chosen username and password.