Koiramäki consists of 4 boulders on a relatively small area, Sushikivi being a bit apart from the others. Approach to the boulders is short, from 2-10 minutes. The boulders are of two different types of rock, Keinukivi and Sushikivi red granite and Jätti and Sirppi -boulders are really nice quality grey (unknown to editor) rock.
Theres a lot of 6th grade problems, thus making Koiramäki a great place for those climbing sixes. It also makes a great place for summertime bouldering for those normally climbing sevens as well. Sirppi and Sushikivi are low, but both still offer a few routes well worth climbing. Keinukivi is a mid-sized boulder, varying 2-4 metres in height. Jätti (giant in English) is a big boulder, as its name implies, but the height of the boulder varies from 2-6 metres.
Rengon Keinu and Lagrangen Piste in Keinukivi have been most popular and highly recommended routes in Koiramäki. There are some really good problems on Jättikivi as well - Tohvelisankari, Mäyrä Kurkkaa ss, Sooloilija and Runsaudensarvi just to name few. But don't forget to give a try for Sirppi -boulders low problems with a really nice rock quality. For those who enjoy lower problems Sushikivi is a good choice as well.
2022 the forest around Keinukivi has been partially harvested. So nowadays it dries a bit faster. But some of the routes are still in the shades most of the day, so you can still climb those even in the sunny summer days. Those include Lagrangen Piste and Rengon Keinu.