 Williams had long planned to design a horror game , but waited eight years for software technology to improve before doing so . Based on Williams ' 550 @-@ page script , about four times the length of an average Hollywood screenplay , more than 200 people were involved in the making of Phantasmagoria , which took more than two years to develop and four months to film . Though originally budgeted for US $ 800 @,@ 000 , the game ultimately cost $ 4 @.@ 5 million to develop , and it was filmed in a $ 1 @.@ 5 million studio Sierra built specifically for the game . 
