The first game that the brothers created was the now-defunct Cash Sprint, a browser-based game where players raced a ghost car and the player with the fastest time each week was rewarded a cash prize. He had previously graduated at the University of Auckland with a degree in geophysics. The decision to develop games was brought about by Stephen upon completion of a game design course at the Auckland Media Design School. Ninja Kiwi Games was founded by Chris and Stephen Harris in 2006. Ninja Kiwi was acquired by Modern Times Group on 24 March 2021. About eighteen months before its dissolution by its parent company, Mochi Media (another major gaming website) discontinued its virtual currency (Mochi Coins) and replaced it with Ninja Kiwi's virtual currency. Ninja Kiwi has a virtual currency known as NK Coins purchases of games and in-game purchases can be transacted using NK Coins. In 2012, Ninja Kiwi purchased Digital Goldfish, a Dundee, Scotland-based developer, for an undisclosed sum. Their most well-known titles are the Bloons and Bloons Tower Defense games. Since then, they have produced more than 60 games across platforms including Adobe Flash, Android, iOS, PlayStation Portable, Nintendo DS, and more recently, Steam. Ninja Kiwi's first game was a browser based game called Cash Sprint, developed on the Adobe Flash Platform. Ninja Kiwi, previously known as Kaiparasoft Ltd, is a mobile and online video game developer founded in Auckland, New Zealand, in 2006 by brothers Chris and Stephen Harris.

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