Please note that it is recommended and often necessary to make reservations at cafés and restaurants.
Tipping in Norway is certainly not expected, but it's certainly appreciated. If you've received excellent service, you can round up your bill to the nearest 10 or 100 kroner or aim for 10 percent of your total, which is considered generous.
In the document below, you can find some recommendations for restaurants in Oslo.
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Restaurant recommendations Oslo (pdf - 2.5 MB)
Restaurant recommendations in Oslo