What is the New Zealand accent?

They pronounce "six" a bit like "sucks," and make "grown" to "grow-en." 

"More" and "sure" are pronounced mua and shua, whereas in Australia they would be pronounced as maw and shaw.

"Iggs for brickfast" is another classic Kiwi pronunciation.  Here is a full discussion, including a detailed contrast with Australian English, you need never be confused again.