I found this place with a quick google search, and although the gym was a bit small, I had a good climb. I didn't go with a partner and didn't have any gear, so I stuck to bouldering. The wall was good with plenty of routes around my climbing level. If this was my base gym, I probably would want more problems. But the gym did seem more centered around sport climbing, so keep this in mind. Eventually, rush hour hit and the gym got a bit crowded. I'd suggest avoiding peak hours if you can.

This indoor climbing center can offer everyone a challenging route. There are two 14 meters high walls with overhang, and one 10.5 meters wall that is mainly vertical. There is also a small bouldering section. The staff is friendly with a lot of knowledge and experience. It is possible to rent equipment and get your "brattkort" at Vulkan. It can get a bit crowded after office hours when it gets cold outside. The locker rooms are not managed by Kolsås klatrekkubb, but are available for climbers as well. Sadly they are not any good.. Bring your stuff, because it's not possible to lock it.