Represented by law firm Maurice Blackburn, former gambling addict Shonica Guy has claimed that the machine's design - including its uneven spread of symbols and the fact that the final reel has more symbols than the rest, allegedly making losses seem like "near misses" - is deceptive and misleading to gamblers.
It is also alleged that overall losses are often disguised as wins, through audio and visual "celebrations", and that the machine's information about the theoretical rate of "return to player" is misleading.
Peter Jopling QC for Aristocrat argued on Thursday that Aristocrat's machines, like all poker machines in Australia, were subject to "strict controls" and multiple laws containing consumer-protection and harm-minimisation measures.
"How could it be said that we were acting in an unconscionable way when all these things have been considered … and taken into account by government and then produced legislation that we've complied by?" he asked.