Wine, spirits and strong beer are only sold at Vinmonopolet - special shops that are wholly owned by the state. Such shops are found in the larger cities and towns.
Beer can be bought at supermarkets. However, in some small towns/villages they have special outlets for the sale of beer.
Most restaurants are licensed.
Within the limit of NOK 6000 you are allowed to bring with you the following alcholic beverages free of customs and excise duty:
a) 1 litre of beverages with more than 22 % up to and including 60 % alcohol per volume as well as 1½ litre with more than 2.5 % up to and including 22 % alcohol per volume or 3 litres with more than 2.5 % up to and including 22 % alcohol per volume
b) 2 litres of beer with more than 2.5 % or other beverages with more than 2.5 % up to and including 4.7 % alcohol per volume.
This means that you may for example bring with you 5 litres of beer provided you do not have with you any other alcoholic beverages.
For importing alcoholic beverages with more than 22 % alcohol per volume the minimum age is 20.