Haunted Halls: Green Hills Sanitarium is a first-person adventure with horror and puzzle elements from developers at ERS G-Studio. The main publisher... Read more
Haunted Halls: Green Hills Sanitarium is a first-person adventure with horror and puzzle elements from developers at ERS G-Studio. The main publisher of the game is Big Fish Games, Inc. Sometimes the game is also called Haunted Halls: Das Grauen von Green Hills.