Discounted tickets are only valid with personal presentation of a valid photo ID.
Minors from 5 up to 18 years and ISIC card holders up to 27 years get tickets with a 50 % discount. Please consider that discounted tickets are only valid with personal presentation of a photo ID (no copies) or with personal presentation of the valid ISIC card (International Student Identity Card). No admission for children under 5 years of age.
Should no valid identity card be presented for admission, the access to the hall will be denied, at least the difference to the regular ticket price is paid on the spot.