First under the name of Kaiparasoft in 2006, Ninjakiwi would later become well known for their tower defense game bloons tower defense (BTD), with the first one being released in 2007. While the BTD series was their most well known games, they also made other games such as Boombot 1 & 2, Crush the Castle and the SAS Zombie Assualt Tower Defense game. The BTD games also have spinoff games such as Bloons Super Monkey, Hot Air Bloon, Bloons Monkey City, Bloons Pop!, and Bloons Tower Defense Battles for example.