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You've been hired to keep watch in a mysterious building with an infinite stairwell. Your task is simple: investigate each floor for strange phenomena. If you find an anomaly, be careful. Test your skills on the global leaderboard and in the weekly challenge event.
PC (Microsoft Windows) · Aug 22, 2025
Worldwide · Exact date · Full release · IGDB
PlayStation 5 · Feb 19, 2026
Worldwide · Exact date · Full release · IGDB
Xbox Series X|S · Feb 19, 2026
Worldwide · Exact date · Full release · IGDB
Nintendo Switch · Apr 30, 2026
Worldwide · Exact date · IGDB
Catalog sources
12 achievements available.

Find all anomalies.
LockedSteam

Try weekly challenge mode.
LockedSteam

Complete a weekly challenge.
LockedSteam

Rescue Shibosu from The Stairwell.
LockedSteam

Complete the game.
LockedSteam

Find your first anomaly.
LockedSteam

Get the gold.
LockedSteam

Visit the Green Well.
LockedSteam

Complete the game on hard difficulty or higher.
LockedSteam

Hidden until unlockedSteam

Complete the game on nightmare difficulty.
LockedSteam

Complete the game on hard or nightmare without making any mistakes.
LockedSteam
Community notes