 Directed by Peter Maris , the game featured a cast of 25 actors , with all filming taking place in front of a blue screen . While most games at the time featured 80 to 100 backgrounds , Phantasmagoria included more than 1 @,@ 000 . A professional Hollywood special effects house worked on the game , and the musical score included a neo @-@ Gregorian chant performed by a 135 @-@ voice choir . Sierra strongly promoted the game , but stressed it was intended for adult audiences . The company willingly submitted it to a ratings system , and included a password @-@ protected censoring option within the game to tone down the graphic content . 
