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Underworld Idle
by e_cha
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Underworld Idle
Tags for Underworld Idle
Description
Underworld Idle is an idle game about underworld management.
The basic mechanics: higher-order units create lower-order units. If you've played games like Swarm Simulator or Antimatter Dimensions, you should be familiar with these mechanics. However, in Underworld Idle I present my own take on these mechanics.
+Game Features+
* Factions (demons, undead, utopians, and blackseekers). Each faction is responsible for producing its own resource.
* Mechanics of creating units. For example, higher demons create lower demons, and so on. The same about units of undead, drowners and warlocks.
* Infinite progression. Start with a small number of resources and expand into a long list of units and huge numbers.
* Infernal Contracts - Prestige Mechanics.
* A variety of locations: lab with energy crystals, junkyard, library with grimoire (containing dark spells).
How to Play
Use mouse to play
Developer Updates
Version 1.03
- Fixed an issue with information for artifacts.
- Fixed NaNNaN for undead when getting a certain spell.
Comments
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kikhaky
Dec. 16, 2025
Kongregate keeps messing with the layout and now it's worse than ever - the game is cropped. Idk why kongregate thinks it needs to continually rebrand itself, but it just keeps getting visually worse and worse. I've been playing this for a few years and it just keeps getting harder to use. If there's another site we can import saves into let me know.
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Ryuven
Jan. 12, 2024
SOME TIPS:
1- pearls stay after rebirth so dont worry. red pearl can buy all with blue double amount upgrate several times.
2- when you rebirth at first, take rune contract so you get those bonuses forever.
3- it takes a long time to get ud contracts and sea contracts, but it adds A LOT. i dont know much later for now.
i've played it for a while... i did found enjoyment in doing all again and again . it have automotions as you get progressed and get contacts for. some kinds of rebirths and prestige. i'm not sure how long i will enjoy doing it again and again though lol. at some point i really dont see where it goes, maybe it will be revealed if i keep on playing. though the higher you get , everything needs more resources.
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AnthonyD2223
Dec. 17, 2025
Does anyone else have problems with getting the achievements, even after you have finished the requirements to get it?
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LamiaDomina
Nov. 27, 2023
So, just logged back in to realize that offline progress doesn't apply to rune creation. Big letdown there.
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toreibjo
Dec. 22, 2025
FRAMES?????????? Seriously Kongregate, something is weird
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