Notes
RemarksGyron was originally released in 2 parts, {Gyron Atrium|Firebird Software Ltd|0018848} and {Gyron Necropolis|Firebird Software Ltd|0002195}. The first person to solve the puzzle in the Necropolis would win a Porsche 924 motor car or £12,500 cash. Since around 60 people did, a play-off was simultaneously organised in London, Spain and Denmark for a third challenge, specifically written for the event, {Gyron Arena|Firebird Software Ltd|0002193}. The winner solved the puzzle in 18 minutes.
Afterward, {Gyron Arena|Firebird Software Ltd|0002193} was published on budget.