Iron Sphere is an arcade game, originally written by Ian Munro in 1990.
It was hoped that it would be released in late 2004, but it was eventually released by Cronosoft in July 2006.
In the game, the player controls an iron sphere and must guide it carefully through a maze consisting of 100 screens.
The aim is to collect all the diamonds on each screen while avoiding holes and bombs.
Retro Gamer reviewed Iron Sphere in issue 18, giving it a rating of 7/10.