Markus did the artwork for many of the most commercially successful pinball games of all time, many of which were merchandising for mostion pictures like Lethal Weapon, Star Wars, Jurassic Park, Last Action Hero, etc and TV shows like Baywatch. Then one one day neighbor Slash called up Markus and wanted in on the action. Being an avid pinball fan, Slash thought it would be cool to have a Guns and Roses game made and before long thousands of them were rolling off the assembly line, a collaberation between the two artists.