Rubicon is a bit like Hawkeye. It also has nothing to do with its 16-bit counterparts despite having the same premise.
Developer Message#
A small cryptic message can be seen at 129A in the RAM while playing the first level.
You had no idea of how difficult cracking is before you met this game,
signed Gollum of Fairlight
In fact, properly cracked versions of the game would not be released until 2017, a whole 25 years after the initial release.
(Source: SexyWayne, TMR)