 In 1988, Ledger and his wife travelled to Bonn, Germany to have his limited edition aviation print signed by famous German World War II ace, Adolf Galland.Toward the end of 1988, Ledger and Marx started working on computer games for Sierra On-Line.He created the art for "" (1990 – Sierra On-Line), "" (1992 – Tsunami Media Inc), "Blue Force" (1993 – Tsunami Media Inc) and "Blood & Magic" (1996 – Interplay Productions Inc).