Reigning champions Brann Bergen started as they left off last season, beating Fredrikstad 4-2 on the opening weekend.
The visitors, eighth last term, fell behind after 18 minutes to a Thorstein Helstead goal.
They equalised through Tarik Elyounossi, but substitute Azar Karadas restored Brann's advantage.
Gardar Johansson equalised before Helstead completed his hat-trick.
Promoted Bodo Glimt sealed a 2-0 win at home to fellow new boys Ham Kam.
They took just five minutes to break the deadlock through Thiago Martins, before Mounir Hamoud added a second in the 23rd minute.
The other promoted side, Molde, battled to a goalless draw at home to last season's runners-up Stabaek, in front of 7,367 at the Aker Stadion.
Tromso, sixth last term, came from behind to snatch a point at Lillestrom.
They had trailed to Simen Brenne's 12th minute goal but a 78th minute equaliser from substitute Douglas Sequeira ensured a share of the spoils.
Viking beat Stromsgodsetare 1-0 through Jone Samuelsen's early goal.
On Saturday, Morten Berre scored the first goal of the new season to earn Valerenga a winning a 1-0 win at home to Aalesund.
They equalised through Tarik Elyounossi, but substitute Azar Karadas restored Brann's advantage.
Gardar Johansson equalised before Helstead completed his hat-trick.
Promoted Bodo Glimt sealed a 2-0 win at home to fellow new boys Ham Kam.
They took just five minutes to break the deadlock through Thiago Martins, before Mounir Hamoud added a second in the 23rd minute.
The other promoted side, Molde, battled to a goalless draw at home to last season's runners-up Stabaek, in front of 7,367 at the Aker Stadion.
Tromso, sixth last term, came from behind to snatch a point at Lillestrom.
They had trailed to Simen Brenne's 12th minute goal but a 78th minute equaliser from substitute Douglas Sequeira ensured a share of the spoils.
Viking beat Stromsgodsetare 1-0 through Jone Samuelsen's early goal.
On Saturday, Morten Berre scored the first goal of the new season to earn Valerenga a winning a 1-0 win at home to Aalesund.
Copyright (c) Press Association
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