No, tickets are not required and cannot be purchased on site, as Hidden Zutphen Square is a publicly accessible area.
Since Hidden Zutphen Square is an open, public area within Zutphen, there is no entrance fee, and consequently, no tickets to purchase. Visitors can access the square freely at any time it is open.
This means there is no ticket booth or entrance gate. You can simply walk into the square and begin your exploration. This simplifies planning, as no advance booking or onsite transaction is necessary.