• Saturday is family day, when parents and kids of any age can come in; Monday to Friday the playground is for kids 6 to 16 on their own
• Projects start at 3pm each day, with the hut-building area open from 2pm; the weekly plan is posted at the playground
• Five youth workers and freelancers from Netzwerk Spiel/Kultur Prenzlauer Berg run the place and its workshops

Kolle 37 is a staffed adventure playground (Bauspielplatz) on about 4,000 square meters near Kollwitzplatz, open since 1990. Kids build their own wooden huts with real tools, make fires, work in the garden and help with the animals. Youth workers run projects in the pottery, the wood and felt workshop, the smithy and a music rehearsal room, and kids help decide what the projects are.