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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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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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croidin
Dec. 08, 2023
Could the creation of runes and prisms please be made to continue when offline too? Even if the creation slows down by half, it wouldn't feel so aggravatingly slow trying to get a prism created that takes 9625 seconds (6th prism to come, many more needed, so time increases a lot more as well!?)... 9625 seconds is 160m25s, or 2h40m25s... just absurd, if you need to keep the game online in order to get the creation done!
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harry37
Dec. 22, 2025
NOT ONLY is this new UI just a ripoff of other (worse) (maybe not anymore) sites like CrazyGames, but the new UI is also strictly worse at displaying critical information. Why do I need to scroll past the description to see achievements? Roll back these changes for the good of the site.
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