On Tuesday night, Prime Minister Jacinda Ardern announced there were four new Covid-19 cases in the community.
Auckland moved into level 3 at midday on Wednesday, and the rest of the country into level 2.
Kiwis outside of Auckland can still continue to go to work and school, with physical distancing, and are advised to wear masks in public.
Businesses can open to the public if they are following public health guidance, which includes physical distancing and record keeping.
In terms of gatherings, New Zealanders must not travel to events with more than 100 people. This includes weddings, birthdays, funerals and tangihanga.
The Government advises all Kiwis to practise good hygiene and stay home if sick.
For more information on what the different alert levels mean for you, click here.
The move to Alert Level 2 means all rest homes are now closed to visitors. The Prime Minister said the move would be "tough but necessary" to protect the most vulnerable. Are you, or members of your family, affected?