Underworld Idle

You manage a growing underworld, starting with a small stock of resources and building up its supernatural workforce. The game centers on expanding this operation rather than on action or exploration.

Higher-tier units produce lower-tier units, creating chains that build up resources over time. Multiple factions have their own production systems, so you balance resources and decide which parts of the economy to develop.

Progress unlocks more units, upgrades, and locations, including a laboratory with energy crystals, a junkyard, and a library with dark spells. Infernal Contracts provide a prestige system: reset progress to gain benefits that improve future development.

Players who enjoy the game often point to its moody pixel art, layered progression, and satisfying growth as reasons to keep returning. Some like having it run in the background, while others appreciate planning upgrades across factions. Reviews also frequently describe progress as slow or grind-heavy, and opinions differ on how idle the game feels.