Theresia is a Nintendo DS action-adventure game from Aksys Games with a dark survival-horror style. The game centers on escaping a maze-like captivity by searching corridors, solving obstacles, and uncovering clues tied to disturbing revelations.

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• Exploration focuses on survival skills, careful investigation, and environmental puzzle solving.
• The story is split across two tales described as twisted love and despair.
• Dear Emile follows a mother and daughter trapped in a world of torture, war, and death.
• Dear Martel follows a doctor whose cure for a ravaging fever leads to something far more dangerous.
• Interactive objects and obstacles include blocked paths, painted rocks, and clue-based discoveries.

Theresia uses the Nintendo DS format for a narrative-heavy horror adventure built around investigation rather than action combat. Its dual-story structure gives the game two separate threads of captivity, survival, and consequence.