The first market mountain biking trail network in Kuopio is located in Puijo. The network was created by Kuopion Pyöräilyseura biking club. The trails are partly quite challenging due to changes in elevation in Puijo.
The website of the local biking club (Kuopion Pyöräilyseura) (https://www.kuopys.fi/maastopyoraily/)
provides more information about mountain biking trails in Puijo. In addition to a printable map, the website contains GPX files that you can download on your mobile phone for navigation.