Nightmare Creatures (ナイトメア・クリーチャーズ) is a survival horror game developed by Kalisto Entertainment and released by Activision for the Nintendo 64 in 1998. The game is set in London in the year 1834 and follows the story of Adam Crowley, a scientist who has been driven mad by his experiments with dark magic. Players take control of Adam as he battles the hordes of monsters created by Crowley's experiments. The game is a 3D action-adventure game, with players controlling Adam as he fights his way through a variety of levels. The game features a variety of weapons, including swords, axes, and guns, as well as magical spells. Players must also solve puzzles in order to progress through the game. Nightmare Creatures features a variety of enemies, including zombies, werewolves, and other monsters. The game also features boss battles and a variety of environmental hazards, such as collapsing floors and traps. The game features a variety of power-ups, such as health and mana regeneration, as well as special items that can be used to access hidden areas. Nightmare Creatures is a challenging survival horror game that features a unique blend of action and puzzle-solving. While the game is not as well-known as some of the other horror games of the era, it is still an interesting and unique experience that fans of the genre should definitely check out.