As a visitor / newly relocated in Norway you need to understand and follow these rules also.
Sale in supermarkets of drinks which contain alcohol (less than 4.75 %) are available to buy at these times:
During the week: 09.00 - 20.00
Saturdays: 09.00 - 18.00
Sundays: It's not permitted to purchase alcohol in supermarkets.
It is allowed however to purchase alcohol free / light beers (2.5% alcohol or lower)from supermarkets. This is possible every day, all day.
Alcoholic beverages with an alcohol percent over 4.75% are only available to buy at the *Vinmonopolet* (basically an off licence)