Laplace no Ma (Rapurasu no Ma, literally "Laplace's Demon") is a Japanese video game released in 1987 for the NEC PC-8801 and NEC PC-9801. The game was also ported to the MSX in 1989.
This video game is a mixture of the role-playing video game and survival horror genres and set in the vicinity of Boston, Massachusetts in a town called "Newcam", it is modeled after the 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 CRPG 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.