Ontotis

Psychological horror with puzzles and endings shaped by your discoveries

Xenoplasis Games · Released Oct 6, 2023

Reviews: Very Positive; 80% of 69
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Playable
Last update on Steam: 2 years ago; May 3, 2024
Minimum PC: GeForce GTX 1070; 12 GB RAM · 8 GB disk; Full requirements

What is Ontotis?

Ontotis is a psychological horror game set in a remote house cut off by a storm. As Robert, a caretaker mourning his wife, you search rooms for useful objects and written clues, solve puzzles, and investigate the history of the former residents.

For you if...

+you like stories that blur reality and nightmares

Not for you if...

−you prefer horror without sudden jump scares

What players say

80% of 69 reviews are positive

Players praise the atmosphere, sound design, and visuals. Recurring complaints concern fast-draining flashlight batteries, unclear next steps, and infrequent saves that lead to lost progress. Some players also find the scares weak.

Screenshots and trailer

Ontotis system requirements

Minimum: GeForce GTX 1070, 12 GB RAM, 8 GB of disk space.

As published by the developer.

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Minimum

OS: Windows 10 64 bit
Processor: Intel Core i5-6500k CPU / AMD Ryzen 5 3600
Graphics: Nvidia GeForce GTX 1070 8GB
Memory: 12 GB RAM
Storage: 8 GB available space
DirectX: Version 12
Notes: The game utilizes Lumen, it is highly recommended to use Resolution Upscaling (TSR) for optimal performance (50%-70% values for low end GPUs, with vsync on and medium settings for 60 fps at 1080p)

Does Ontotis have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does Ontotis run on Steam Deck?

Playable Playable: it runs on Steam Deck with some adjustments.

Sometimes shows mouse, keyboard or non-Deck controller icons
Some in-game text is small and may be hard to read
Default configuration is not performant
The native resolution is not the default one
All functionality is accessible with the default controller configuration

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Achievements: 9
Steam features: Family Sharing
Languages: Full audio: English. Text only: French, Spanish - Spain, Portuguese - Brazil, Spanish - Latin America, Japanese, Turkish.

Does Ontotis use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam