IBM commissioned Sierra to produce a game that could showcase these new capabilities. They discussed some requirements for the game, and IBM supplied Sierra with a PCjr prototype. They both agreed that the game should be animated—a first for Sierra. A team of six designers and developers, led by designer Roberta Williams, worked on the game that was eventually titled "King's Quest". Among the developers were Chuck Tingley and Ken MacNeill (later releases also credit Chris Iden. An Apple II version credits Arthur Abraham).