UNDEMON

69KS
Released Nov 19, 2021by WEST SUNPositive(93% of 14 Steam reviews)

Go on a mysterious adventure as a ghost. Various stages that stimulate a sense of challenge are waiting for the ghost Luna. If you want to feel the genre of 2D platformer in the 90s, try it!

Offers

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Official stores

Official stores with direct support.

Steam
SteamOfficial
updated

Keyshops

Third-party resellers. Often cheaper, without official store support. Keyshop prices vs Steam →

Gamivo
GamivoKeyshop
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Lowest price
-92% vs Steam$1.16
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About UNDEMON

Go on a mysterious adventure as a ghost. Various stages that stimulate a sense of challenge are waiting for the ghost Luna. If you want to feel the genre of 2D platformer in the 90s, try it!

Synopsis

One dark day... A strong lightning strike a shabby tomb hard.

Due to the unknown cause, a ghost in the form of a woman appears in the tomb, but ghost suffer without remembering anything. Someone found a ghost in a house nearby, the game begins as the ghost notices it and enters the house.

Why did the main character become a ghost? Go on a mysterious journey to find out who did it!

Game mode

  • Normal mode: You can enjoy at a moderate difficulty.
  • Original mode: This is the basic mode before the normal mode, and it is difficult in the early game due to the slippery controls, narrow field of view, and other ability factors.
  • ???: It is unlocked once cleared regardless of the mode, and it is a level of difficulty that can be enjoyed in a unique situation that requires collecting souls to acquire 1UP.

Hide System

Luna, a ghost, can hide slightly as a "hide"(not completely), and It can stun state the other person for a while or pass through the body. However, most people drink strange water, can see the existence of the ghost Luna.

Hiding is useless against animals.


Certain obstacles can be passed as 'hide' state.


Bump as 'hide' state at humans enemy. The human enemy in stun state for a moment and the attack is valid.


Bosses have strong energy and cannot give them a state of stun, but they pass through the body as they are. Instead, if you continue to attack, they can be stun state, so aim for that time.

Sight System


Luna hasn't been long since she became a ghost, so can only see humans her closely without lighting. However, raising your ability widens the scope of seeing humans. But, she can see animals regardless of sight range.

Ability

Collect souls, and raise your ability.


Normal mode

  • Attack - Attack power is increased.
  • Sight - The extent to which human enemies can be seen increases. (Including human bosses)
  • Flying time - Flying time is increased.
  • Recover Flying - The recovery time of flying ability is reduced.
  • Fire resistance - Reduces damage caused by fire by 50%.
  • High jump - Jump power increases.

Original mode

  • Attack - The offense gradually increases, and the energy flies to the end.
  • Sight - The extent to which human enemies can be seen increases. (Including human bosses)
  • Friction - It becomes easier to control the movement of slippery ghosts.
  • Hiding time - Hiding time increases.
  • Recover Hiding - The recovery time for hiding ability is reduced.
  • Flight/Flying time - Flying becomes possible, and flying time increases.
  • Recover Flying - The recovery time of flying ability is reduced.

Stage progress


At the beginning of the stage, check the yellow key's image on the hint sign.


Find the key on the stage. You can't throw away the key once you get it. Yellow keys may have fake ones, so check them out in detail. If the key you checked matches the key you found, obtain it.


The red key doesn't have a fake. If you find it, get it right away.


Enter the next step using the right yellow key. If a fake key is used, you will receive a penalty.

Game details

Game details

Released
Developer
Publisher
Platforms
Controller support
Full
Steam rating
Positive (93%)

Age ratings

IGRS 18KGRB 12DEJUS 10STEAM_GERMANY 6

Game modes

UNDEMON price history

Lowest tracked price: $1.16 (Jul 8, 2026) · current best: $1.16 across 2 stores.

UNDEMON reviews

93% positive reviews all-time.

UNDEMON — frequently asked questions

Where can I buy UNDEMON at the cheapest price?

Right now the cheapest offer for UNDEMON is $1.16 at Gamivo. KingsPrice compares 2 offers from 2 stores — official stores and keyshops — and refreshes prices throughout the day.

What is the lowest price UNDEMON has ever been?

The lowest price KingsPrice has tracked for UNDEMON is $1.16 (recorded on Jul 8, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.

Is it safe to buy a UNDEMON Steam key from a keyshop?

Keyshops are marketplaces that resell game keys, usually below official store prices. The keyshops listed on KingsPrice deliver genuine Steam keys, but buyer protection differs from official stores — check the shop's rating and refund policy before buying. You can hide keyshop offers at any time with the keyshops toggle. Keyshop prices vs Steam →

How can I get UNDEMON at a discount?

Create a free price alert on this page and KingsPrice will email you when UNDEMON drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.

System requirements

Minimum

Minimum:
  • OS *: Windows 7
  • Processor: Intel Core 2 Duo U7600
  • Memory: 2 GB RAM
  • Graphics: NVIDIA GeForce GTX 1060 3GB or AMD Radeon HD 6250
  • DirectX: Version 9.0
  • Storage: 1 GB available space
  • Sound Card: NVIDIA High Definition Audio

Recommended

Recommended:
  • OS: Windows 10
  • Processor: Intel Core 2 Quad Q9000
  • Memory: 8 GB RAM
  • Graphics: NVIDIA GeForce GTX 1060 3GB or AMD Radeon HD 6250
  • DirectX: Version 11
  • Storage: 1 GB available space
  • Sound Card: NVIDIA High Definition Audio

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