The game was withdrawn from sale shortly after release in Europe, in response to Activision's threat of legal action over its alleged infringement of their R-TYPE license. Subsequently, KATAKIS was renamed to DENARIS and re-released in 1989 with reworked levels.
 Game designed by Factor 5.
 The original release comprised 2 disks, while the HIGHLIGHTS compilation version came on 1 disk.
TRIVIA: Activision paid a substantial sum to license Irem's R-TYPE coin-op for home computer conversion, but hadn't released any conversions at that point and were quite annoyed that sales could suffer at the hands of what was quite a good independent clone in KATAKIS. Despite their grievances, Activision were sufficiently impressed with game developers Factor 5, that they contracted them for the C64/Amiga conversions of R-TYPE.