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Underground Security Inc DemoEventsDemo Balance Update + Bug fixes
Game update

Demo Balance Update + Bug fixes

Underground Security Inc Demo · published 21 Mar 2026, 07:12 UTC

All eventsPlayers around this dateRead on Steam

An update to the rebalancing some of the gameplay elements as well as reworking some of the minion and tome abilities.

Minion Ability Changes


Some of the minion abilities have been reworked to reduce some of the complexity of the higher rarity minions. Now, on average uncommon minions have 1 - 2 abilities / starting perks, rare minions have 2 abilities / perks while legendary minions have 2 - 3 abilities / perks. Some abilities such as the Cult Leader requirement for the Enchanter and Necromancer have been reworked to be simpler. In general, card draw abilities have been reduced and more minion abilities favor "when deployed" while legendary minions are a little weaker in general.

Reworked minions: undertaker, lich, enchanter, necromancer, gorgon, vampire. greenling, troll, mastermind

Economy Modifications

The coin economy has been slightly altered. Now players gain 2 coins for successfully completing a night without any heroes reaching the chest, however, tools now cost 5 coins and ancient tomes have an average cost of 7 coins. In additional legendary minions can no longer be purchased through a night bonus, instead, they can be gained without spending any coin but greatly increasing the difficulty of the incoming day's wave.

Building Changes

Graveyard, Demon Spawn have increased cooldown times. Mausoleum has been changed to a 4 channel cost augment building, that spawns 3 wraiths whenever a minion or hero is defeated in range. The chest has also been modified to be unmovable.


Ancient Tome Changes


Some ancient tomes have been rebalanced. For example, Meditations which used to retrigger "when deployed" ability a second time only triggers on the first deployed minion each night phase. Other ancient tomes have been reworked to make it a little more difficult for players to cycle through their entire deck in one night.

Reworked / Rebalanced tomes: Epic of Errra, Elements, Apicius, Profit Plan: Hedge, Profit Plan: Capitalization, Consolatio, Les Propheties, The Shipwrecked Sailor, Code of Urukagina, Frankenstein, Il Milione, Digenes Akritas

Bug Fixes

  • Fixed some bugs with drawing and sacrificing minions in specific scenarios

  • Fixed Code of Urukagina not triggering properly

  • Fixed interaction between catacombs and Hippias Minor

  • Fixed entrance generation where sometimes a new entrance would spawn right next to the chest

More from Underground Security Inc Demo

Other announcements

All events
Underground Security IGame update11 Sep 2026Demo Patch v0.4.20Quick hotfix to the demo fixing a bug with the Shadow Mage where the dark synergy was trigger on assign and past the normal 3 ability cap.Underground Security IGame update22 Aug 2026Demo Patch v0.4.24A quick update to the demo to fix a few bugs · Modified the logic for Tomida Femina so that it no longer tries to draw past your hand size · Fixed a bug where Book of Riches Volume 3 does not trigger · Fixed an issue where restarting the day while in a tutorial screen disables tooltips temporarilyUnderground Security IGame update10 Aug 2026Demo Patch v0.4.23Demo patch fixing some bug fixes: · Fixed a bug where minions could be dragged from the crypt and deck could allow the minion to be deployed or assigned into the dungeon · Fixed an issue, where opening the settings menu on controller can lead to a soft-lock while in the tutorial