No, tickets are not required as entry to Open Spijkenisse Castle is free for all visitors.
As there is no admission fee for Open Spijkenisse Castle, there are no tickets to purchase, either on-site or in advance. Visitors can simply arrive and enter.
This straightforward access contributes to its appeal as a spontaneous day trip destination. There are no ticket counters or reservation systems to navigate; the site is freely accessible during its opening hours, which might vary but are generally generous.