Acrophobia has similarities to the board game "Acronymble," which came on the market in 1991 and is produced by Acronymwits Inc. Acronymble works almost exactly like Acrophobia, but with the added twist of sometimes giving players all same letters to work with (e.g. 6 G's) and at other times allowing players to use their own words (e.g. using a 5 letter word that begins with "P") as the basis for their acronym.