Why it works for a birthday
Kids lose interest fast, so the route is short and front loaded, hitting its peak while everyone is still together. The difficulty curve stays gentle on purpose: a birthday that gets genuinely hard stops being a party.
Most missions are photo and creative ones, because those are the missions any child can do at their own pace, and they are also what the parents still have at the end of the evening.
What you need to prepare
One phone per team, and an access code you send to the parents. That is the whole setup.
If you have no time to design a route yourself, you can ask the system to compose one from your area, the age of the group, and how long you have. What comes out is ready to launch.