The Ultimate titles up to Gunfright were produced primarily by Tim and Chris Stamper, Tim provided the graphics and Chris the programming, along with fellow founders John Lathbury (coding) and Carol Ward (graphic design). Tim also created the cover art for the games, including the famous Ultimate Play the Game logo. The Stampers retained the major creative roles until the purchase by US Gold, who brought in their own programming teams to create "Martianoids" and "Bubbler". The exact authorship of "Pentagram" and "Cyberun" is known only to those involved; often considered US Gold games, they are both possibly Stamper games. This remains a possibility as although Chris Stamper has said in an interview, "What was the last one we developed as a team? It was "Gunfright", I think", Ultimate had already admitted to developing games in an order different from that of their release, as with "Knight Lore" and "Sabre Wulf".