For playing a city game in Alkmaar, April, May, June, July, August and September are usually the most pleasant months. During that period, walking is often more comfortable, it is easier to stay outside longer and a city treasure hunt feels less like a logistical task. That suits an activity you want to experience in a relaxed way.
Playing a city game in Alkmaar usually requires a budget that depends mainly on transport, guidance and any materials you need. The core activity itself is often only one part of the total cost. What you end up paying depends mainly on how you travel to Alkmaar, whether you want extra guidance and whether you need anything else along the way, such as food, drinks or an extra version of the route.