Mellunmäki is one of the oldest bouldering areas in Helsinki region. The rock quality varies from good to very bad. The rocks dry slowly after the winter and rain, but there are problems which dry out quite early, mostly located at the Metropolis boulders.
Mellunmäki is one of the most popular bouldering crags in the Helsinki region and hosts many classics from easier Reebus (6A), Telepatiaa (6B) and Dylan on Messias (6C) that offer varying and fun challenges. Mellunmäki has a very wide selection of harder routes from which Kurt, Kurre Orava (7A), Genderblender (7A+), Metropolis (7B), and Melankolia (7B+) are the most popular and liked routes.