The Gambling Act 2003 is the main New Zealand law controlling what gambling is allowed, who can run it, where it can happen, and what operators and venues must do to stay compliant. It is administered by the Department of Internal Affairs and remains in force.
For a business owner, the practical point is simple. If you run gambling, host gambling, advertise gambling, handle gambling equipment, or receive gambling proceeds, you should check the Act early. The law covers prohibitions, licensing, venue approvals, machine limits, banking of profits, reporting, customer-facing controls, inspections and enforcement.