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.^[2] Ninja Kiwi's first game was a browser based game called Cash Sprint, developed on the Adobe Flash Platform.^[1] Since then, they have produced more than 60 games across platforms including Adobe Flash, Android, iOS, PlayStation Portable, Nintendo DS, and more recently, Steam. Their most well-known titles are the Bloons and Bloons Tower Defense games. In 2012, Ninja Kiwi purchased Digital Goldfish, a Dundee, Scotland-based developer, for an undisclosed sum.^[3][4][5]

Ninja Kiwi has a virtual currency known as NK Coins; purchases of games and in-game purchases can be transacted using NK Coins. 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.^[6]

Ninja Kiwi was acquired by Modern Times Group on 24 March 2021.^[7][8]

Ninja Kiwi Games was founded by Chris and Stephen Harris in 2006. The decision to develop games was brought about by Stephen upon completion of a game design course at the Auckland Media Design School. He had previously graduated at the University of Auckland with a degree in geophysics.^[9] 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.^[1] However, they were unable to draw in advertisers to finance the project and were forced to scrap it after 14 weeks of operation. Next, they launched their own web portal that pooled to get developer, Digital Goldfish, who wanted to team up to release Bloons as an iPhone application, where it reached the number two position in the US app store.^[10] The relationship between Ninja Kiwi and Digital Goldfish continued long after this, with several members of the Digital Goldfish staff being completely devoted to the mobile development of Ninja Kiwi games.

In 2012, Ninja Kiwi purchased Digital Goldfish. The previous titles that the two companies created together had racked up millions of downloads. Due to the already close relationship between the two companies, the merger was described by Digital Goldfish co-founder, Barry Petrie, as a "natural progressive step in the relationship between the two companies". Digital Goldfish was renamed Ninja Kiwi Europe.^[11] The merger increased the total number of Ninja Kiwi employees to 35.^[5] By 2021, the total number of employees had increased to 70.^[12][13]

On March 24, 2021, Ninja Kiwi was acquired by Modern Times Group for around 1.6 billion Swedish crowns ($186 million USD), to "broaden its gaming portfolio",^[14][15] with expressed intent to expand into the tower defense genre whilst still maintaining the high quality standards that it strives for.^[16][17] The negotiations with MTG began on January 14, 2021, starting with an initial sum of between $130 and $150 million USD.^[15][17] Maria Redlin, MTG's group president and CEO, expressed her interest for acquiring Ninja Kiwi because of how they have created a "successful combination of paid and in-app purchase models in its pricing structure", which she argues is a major factor in Ninja Kiwi's success at creating quality games.^[18][16] The founders of Ninja Kiwi have responded that they are "genuinely excited to join MTG", with intent to join them on creating future business opportunities together.^[18] Ninja Kiwi had also announced their plans with MTG over the next year, including releasing Bloons TD Battles 2, the sequel to the multiplayer tower defense game Bloons TD Battles.^[16]

• Ninja Kiwi Europe (formerly Digital Goldfish) in Dundee, Scotland, was acquired in 2012.

Awesome Points were used to keep track of a player's achievements and medals they earn within Ninja Kiwi games. Depending on how much Awesome Points a player has, they may level up.

Leveling up entails a newly earned title with the highest being rewarded at Level 59 being called "Sky Spirit", and a spin of the wheel of fate, and a new avatar as a reward. Awesome Points can also go to a Clan's total awesome, pushing their clan up the rankings. Another reward that comes with leveling up is either differently colored profile stars to the value of one's votes on the forum being multiplied.