Ursvik Ultra 75 km:
5 laps on the 15 km track. Separate men's and women's classes. Start at 00.00 (midnight) between Saturday March 27th and Sunday March 28th 2010.
Ursvik Ultra Light 45 km:
3 laps on the 15 km track. Separate men's and women's classes. Start at 03.00 am Sunday March 28th 2010 (03.00 am wintertime, 3 hours after the start of Ursivk Ultra 75km)
Relay class 5 × 15 km
The team consists of 2-5 participants who divide the 5 laps between them. If the team consists of two people, participant number 1 may therefore run 2 laps and the participant number 2 runs 3 laps. It is only allowed to change/switch runner at the end/start of every lap (i.e. in the exchange area at TC). Men, women and mixed teams compete in the same class. Start at 00.00 (midnight) between Saturday Mars 27th and Sunday Mars 28th 2010.