Aztec Challenge is an original game designed and programmed by Robert Tegel Bonifacio in 1981 for the Atari 400/800. It was 6K total in size so it could work in a minimum of 8K RAM for the Atari 400 and available on cassette and 5 1/4" floppy. It was originally called 'The Bonifas' and the original theme was a robot running a futuristic obstacle course. It was first submitted to the Atari Program Exchange (APX) but non-exclusively picked up by COSMI instead when it was renamed 'Aztec Challenge' and redesigned to feature more detailed graphics and two-player simultaneous play. The redesigned game was released on floppy disk only as its code size exceeded that which could be played on the Atari 400. It was advertised by COSMI to run in 16K RAM as well just to be sure of good operation on limited systems. The original designer and programmer Robert Tegel Bonifacio is now President and CTO of Code Robert, LLC at http://CodeRobert.com located in Maui, Hawaii.
As Aztec Challenge was COSMI's first big seller, they eventually wanted a Commodore 64 version. Aztec Challenge was later redesigned and programmed by Paul Norman and published by Cosmi in 1983. While based on the original Atari version, the Commodore 64 version had 48K+ usable RAM to work with and a better graphics and sound chip, so that version benefited greatly by having more different levels and a very good sound track written by Paul Norman.
At the same time, COSMI did a moderate update to the original Atari 'Aztec Challenge' which featured slightly better graphics and an Instant Replay at the end of each level. This was also released in 1983.
This game was remade in 2003 by Paul Norman as Azteca: Queen of Quezalcoatl, It is only found on his website, DigiTTARIUS.
It also also important to note that this version is a "tri-compatible" one, including code on the cassette for the Atari, VIC-20 and TI 99/4A.