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Ninja Kiwi, which was previously known as Kaiparasoft Ltd, is a mobile and online video game developer founded in Auckland, New Zealand. It was founded in 2006 by brothers Chris and Stephen Harris.

Ninja Kiwi's first game was a browser based game called Cash Sprint, developed on the Adobe Flash Platform. Since then, they have produced more than 60 games across platforms including Adobe Flash, Android, iOS, PlayStation Portable, Nintendo DS, and more recently, Steam. They are most known for producing the Bloons and Bloons Tower Defense games.