Steam app 3344320 · updated 12 Sep 2026, 22:19 UTC
Lethal Dungeon is a roguelike card game. Win every battle using only the cards in your opening hand to defeat all enemies in a single turn.
264 hourly samples, with the daily peak drawn over them. Weekends are shaded.
8 months, February 2026 to September 2026. The highest number of people in the game at once, each month, on a time axis -- a gap in the record stays a gap.
The highest number of people in the game at once, each month. Four, because four is as far back as the source keeps anything finer than one figure a month.
31 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
31 days as the curve, each the highest figure that day. Behind it, 164 hourly samples from 13 Aug, which is as far back as the source keeps every hour. Weekends are shaded.
12 days as the curve, each the highest figure that day. Behind it, 100 hourly samples. Each dip is a night. Weekends are shaded.
Lethal Dungeon was released on 19 Feb, 2026.
| Language | Full audio |
|---|---|
| English | |
| Simplified Chinese | |
| Japanese |
A blank audio cell means full audio was not marked in the returned language list.
6 achievements in total.
10 developer announcements, Aug 2025 to Jun 2026 · times in UTC
- Adjusted post-clear mode difficulty. - Fixed the Treasure Gallery screen.
Patch notesFixed bugs
Patch notesAdded relics “USB Drive” and “Holy Graill”Added a feature to view all treasures you have obtained so farRemoved “Strike Up” and “Water Stone”“Trinity” has been strengthened and renamed to “Singularity”“Contract” nerfed: activation limit…
nihoheFixed several bugs.
Patch notes- Fixed an issue where cards from treasure chests could not be obtained while the deck window was open - Fixed sorting so it is now always available from the deck window - Fixed a bug that occurred when clicking the “Start Dungeon” button…
Patch notesFixed a critical issue affecting the Print Deck.
Patch notesWe're pleased to announce that Lethal Dungeon is now available, and will be on 10% launch discount for the next two weeks!
nihoheWe have updated the demo.If you encounter any issues, please let us know.The content is not significantly different from the previous version.
Patch notesRoguelike card game “Lethal Dungeon” will be released on February 20, 2026.
nihoheThe demo is now available to play.
nihoheWhat Steam runs, and with what. Straight from the app configuration.
| Description | Executable | Arguments | Platform | |
|---|---|---|---|---|
| Launch | LethalDungeon.exe | any |
The folders Steam Cloud syncs. The root is a token Steam uses for a location on your own machine, not a path this page can know.
| Root | Folder | Files |
|---|---|---|
WinAppDataLocalLow | Nihohe Soft/LethalDungeon | *.es3 |
It runs on public data and somebody's spare time.
https://paypal.me/KintaroPalPay[email protected]0x4d559C765AA8BFe336E36d5b76024926767eD38dTJtctWU9uetJaTBoSybd1RErW7n9duTKVG