Initially released in 1988 as KATAKIS, but with different levels. The game, however, was withdrawn from sale shortly after release in Europe, in response to Activision's threat of legal action over its alleged infringement of their R-TYPE license.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 design by Factor 5.
 The original release comprised 2 disks, while the 5TH ANNIVERSARY 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.