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 The game, however, was withdrawn from sale shortly after release in Europe, in response to Activision's threat of legal action over its alleged infringement of their R-TYPE license.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.
 The original release comprised 2 disks, while the 5TH ANNIVERSARY and HIGHLIGHTS compilation version came on 1 disk.
 Distributed in Germany by Rushware.
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.
Based on 1988 Factor 5/Rainbow Arts/GO! C64/128 release.
After inserting disk 2, press ‘Y’ and use the mouse in port 2, press the RIGHT BUTTON until level 1 has loaded.