Laplace no Ma (ラプラスの魔, which literally translates to "Laplace's Demon") is a Japanese role-playing game with adventure game elements initially released on July 4, 1987 for the NEC PC-8801 and PC-9801 computers. Humming Bird Soft developed the title and it was ported to several other computers including the MSX in 1989 and the Sharp X68000 in 1990. A console version of Laplace's Demon was later developed by Human Entertainment for the PC-Engine CD in 1993 and Vic Tokai created a Super Famicom version in 1995. PC re-releases of the original PC-88, 98 and Sharp X68000 editions of the game were also published by D4 Enterprise on Project EGG in 2014 and 2016. Laplace's Demon eventually grew into a multi-media franchise called Ghost Hunter that encompassed novels, manga, table-top RPGs and two video game sequels developed by Humming Bird Soft.
Laplace's Demon is a mixture of the role-playing as well as survival horror genres and is set in the vicinity of Boston, Massachusetts, in a town called "Newcam"; it is modeled on fictional city Arkham created by H. P. Lovecraft. The horror part of the game lies in the exploration of the fictional Weathertop Mansion, whose owner dabbled in black magic. The game's RPG features include its character classes—Dilettante, Medium, Detective, Scientist, and Journalist—and that the player can leave the mansion to walk around the town to go to shops to buy items needed to defeat the monsters and complete the game.