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Nightmare of Decay: a mansion slowly unravels

Nightmare of Decay:Firing a pistol at an approaching zombie
Firing a pistol at an approaching zombie1 / 10

Something you find opens the way to a closed-off place. Reviewers enjoy exploring the manor and feeling its puzzles click together.

What makes it fun

  1. Unravel the mansion

    Finding keys opens doors, while connected puzzles lead to new parts of the mansion. Exploration gradually turns apparent dead ends into routes forward.

  2. Hold still for the shot

    Moving widens your aim; standing still tightens it. Enemies keep closing in while you line up a shot, making the choice to fire or back away tense.

  3. Fight or slip past

    Enemies in the mansion can be avoided instead of killed. Choosing whether to spend limited ammo or find a route around their positions becomes part of exploring.

Game details

As of Oct 29, 2026
Playtime at review
3.5 hoursMedian at the time of review (based on 100 helpful reviews)
Languages
English, Simplified Chinese / 15 languages total

A typical run

First-person horror about escaping a nightmarish manor.

A walkway lined with bookshelves (Nightmare of Decay, via Steam)
A walkway lined with bookshelves (Nightmare of Decay, via Steam)

Core systems

Limited ammo and resources

Use weapons to fight monsters.

What to decide

Consider your ammunition and supply use.

Firing a pistol at an approaching zombie (Nightmare of Decay, via Steam)
Firing a pistol at an approaching zombie (Nightmare of Decay, via Steam)

What sets it apart

Reviewers enjoy visuals or atmosphere reminiscent of older horror games.

Learning curve and difficulty

One reviewer enjoys the tension of calmly standing still for an accurate shot while an enemy approaches.

Builds and playstyles

Lure enemies to open a path

During a knife-focused attempt, one reviewer enjoyed planning routes that lured enemies aside to create openings.

Red-eyed dogs ahead of the knife (Nightmare of Decay, via Steam)
Red-eyed dogs ahead of the knife (Nightmare of Decay, via Steam)

What longtime players say

Reviewers enjoyed pursuing achievements and challenges such as knife-only runs.

What players like

Reviewers enjoy exploring the manor or solving puzzles.

Reviews praise decisions about managing limited resources.

Common complaints

Reviewers dislike slow movement or difficulty manoeuvring near enemies.

Reviewers find the story or ending unsatisfying.

Window light falling across the dining room (Nightmare of Decay, via Steam)
Window light falling across the dining room (Nightmare of Decay, via Steam)

Who it’s for

For players who enjoy searching a manor and opening paths while conserving supplies.

Who might not enjoy it

If you want shooting built around constant fast movement, consider the complaints about sluggish movement or aiming.

Zombies closing in between the beds (Nightmare of Decay, via Steam)
Zombies closing in between the beds (Nightmare of Decay, via Steam)

FAQ

Is story the main attraction?
Reviews describe exploration or survival as the appeal over the story.
Nightmare of Decay
Nightmare of Decay

95% Overwhelmingly Positive ・ US$4.99

View on Steam ↗

Image: Nightmare of Decay on Steam