Kim Dotcom and wife Mona greeted around 900 people on Saturday during the Christmas in Coatesville house and garden tour.
People queued for more than an hour to see his mansion.
A special bus leaving Coatesville village took 50 people on each tour of the expansive grounds.
The $30 million property was the highlight of 12 homes open to the public for charity.
More than $120,000 is expected to be raised, with 90 per cent of proceeds going to Coatesville School and the remainder donated to the New Zealand Gynaecological Cancer Foundation.
Kim and Mona posed for photos with people outside their mansion. Kim also put photos of the day on Twitter after greeting visitors by name and chatting with them.
"Great fun at the Dotcom Mansion," he posted. "Raising funds for the local school. I met a lot of lovely people today!
"Santa was here too. What a fun day. Thanks to everyone who bought a ticket."
A glass of bubbly was offered and callers could then look around the gardens, pool and grounds which include a maze, blow-up tank and a model rhino and giraffes.
Security staff were helpful and friendly. Doors and windows were left open so visitors could clearly see inside.
People pressing their noses to the windows could see a massive fish tank running behind the state-of-the-art kitchen, and European styled furniture, as well as staff working.
The property is owned by Richard and Ruth Bradley, the British founders of Chrisco, and leased by Kim.
"Wow - what a fantastic day," organiser Bridgette Jackson posted on Facebook. "Thank you to everyone who came and a huge thank you to all our lovely Coatesville home owners who generously shared their beautiful properties."
"Without you, today would not have been possible . . . And of course, to the organisers, sponsors and volunteers . . . Thank you for making Christmas in Coatesville happen and congratulations on such a fantastic and successful event."
Other houses featured in the tour included the home of Katrina Browne, who starred in Power Rangers, Xena Warrior Princess and Young Hercules. She also appeared in Outrageous Fortune and Shortland Street. Katrina was joined on the day by Shortland Street actor Beth Allen.
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