"Nightmare Dorm" is a free strategy game developed by HexagonalGames for Android devices. In this game, the players will have to defend their dormitory building from the evil spirits that have broken in. The game starts with the ghost attacking the dorm door frantically, and the players need to build facilities and defenses to fight against the evil spirits.

The gameplay is simple but thrilling. The players have to hide in the bed to avoid being caught by the ghost and build facilities to enhance their defense. The game also offers a variety of weapons to help players fight against the ghost. As the game progresses, the players can unlock more advanced weapons and upgrade their facilities to increase their chances of survival.

Overall, "Nightmare Dorm" is an enjoyable strategy game that offers a thrilling experience. With its simple gameplay and challenging levels, this game is sure to keep players engaged for hours.