ref: http://www.retroremakes.com/forum/showthread.php?threadid=2290

Minion (author):

"REPTONY2K and ATIC ATAC are both remakes of old BEEB games I had and played (yes, I know Atic Atac is a speccy game, but I never had a speccy, only a beeb, so mine is based on the beeb version, hence the speed difference)."