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Underground Security Inc DemoEventsDev Log: Buildings Mechanics + Upcoming Playtest
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Dev Log: Buildings Mechanics + Upcoming Playtest

Underground Security Inc Demo · published 31 May 2025, 00:20 UTC

All eventsPlayers around this dateRead on Steam

We are still hard at work at building a demo. In the meanwhile here is a preview of the building system we have been working on.

You dungeon will require buildings to help in its defense. Depending on its type each building will have an associated build cost (blue) or channel cost (purple) required for construction. In order to fulfil the construction cost of a building, minions must be assigned with the appropriate skills.

Buildings can apply damage and debuffs to incoming heroes in a variety of ways. Different buildings have differing ranges, attack speeds and some can only be activated by spending "charges" which replenish each day.


Once buildings have been constructed they can be upgraded by assigning minions with upgrade skills (yellow). Upgrading is a great way of getting more value out of constructed buildings since the number and types of buildings available to you is limited by randomized building plans discovered in each run.

Some buildings can also summon minions in combat or be used to generate additional resources to power up your economy.

Some buildings will interact with other buildings or minions placed in your dungeon:

We hope the varied building options will allow players to find creative synergies in each run!

Want to Help Build Underground Security Inc?

We are looking to open public playtests in the near future. If you would be interested in helping shape the future of the game or just to play around with the game mechanics extra early, keep an eye out for our upcoming announcements!

More from Underground Security Inc Demo

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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