Each version of The Hitchhikers Guide to the Galaxy has its own unique charm. The five novels let you revel in Douglas Adams gloriously strange writing, while the radio show lets you hear what a Vogon actually sounds like. But none of them will put you through the roller coaster of emotions that the text-adventure game does. First released in 1984, five years after the debut novel, the game was developed by Infocom, a pioneering force behind the text-adventure genre thanks primarily to its Zork games.