Theresia

Theresia is a Japanese psychological horror adventure game distributed in five chapters for feature phones. Set in an unnamed European country during wartime, the story follows an amnesiac man who awakens inside a decaying mansion. The building is filled with deadly traps, disturbing messages written on the walls, mysterious red particles, and the faint sound of bells.

As he explores the mansion and its surroundings, the protagonist must avoid traps, solve puzzles, and recover fragments of his lost memories to uncover the truth behind the mysterious word "Theresia."