of Aero in 1992. Although Aero's early designs resemble a human acrobat, Siller always intended him to be a bat. The gameplay mechanics were partly based on Namco's Mappy series. By this time, Siller had agreed to join Sunsoft of America. The final concept was designed by David's son Justin Siller, who was inspired by mixed themes from the 70s and 80s. Some of the enemies, items and in-levels that Siller proposed never made it in the finished game. The concept included a mission objective feature, which was not added in the original release. However it was implemented and modified in the Game Boy Advance version. Originally Aero was going to be released for the original Nintendo Entertainment System, but by this time 16-bit consoles were on the market, so the NES version was cancelled. Much of the game's work took place at Orange County, California. Both the Super NES and Genesis versions were being worked on simultaneously, but the Genesis version was released earlier as the Super NES version reached its final stages of development. Plans were made by Sunsoft to port the game to Atari Jaguar sometime in 1994, but this version was never released. After the success of the sequels, Siller left Sunsoft and joined Universal Interactive. Universal bought the rights of Siller's character and were intent on making Aero their mascot. He had intended to start up a sequel to the second game titled "Aero the Acrobat 3D" to be released on PlayStation to complete the series as a trilogy, but this concept never reached development, as Universal turned their attention to Crash Bandicoot. Following the success of that game, Crash was their official mascot instead of Aero. With no success in starting a new Acro-Bat game, Siller bought back Aero as he left Universal. While Siller worked at Capcom, the USA Bill Gardner wanted to make use of Aero, but the Japanese HQ denied that request in accordance to Siller's contract. By summer 2002, Siller had to relocate to Texas. He did not have the funds to form his own studio, but was able to hire Atomic Planet to port his original game to the Game Boy Advance. Metro 3D found the game very promising for marketing and Siller directed the port during its development. In addition Siller wanted to port the two sequels Aero the Acro-Bat 2 and Zero the Kamikaze Squirrel on Game