Game artwork from the official Steam store; rights belong to the respective publisher.
Base game (Steam) · PC
CN · CNY · Steam
Price observed in the CN store. A Steam account is required. Check the store for package contents, operating-system support and regional purchase restrictions.
“Does the moon cease to exist when I’m not looking?”
CASSETTE BOY was inspired by a question from quantum mechanics and lets you explore a world where what isn’t seen… doesn’t exist.
In this strange world that changes with your perspective, pursue the secrets of the missing moon.
A world that seems 2D, yet hides a 3D reality
At first glance, it seems like a 2D pixel-art world, but it’s actually a fully 3D structure.
Rotate the map to discover new surprises.
A puzzle that plays with what you see
In this world, things that aren’t visible simply don’t exist.
Official store excerpt · Description source ↗
Read the store description ↗
Base game
No other base game is required.
Activation: Steam
A Steam account is required.
Supported platforms: Windows, macOS
Official CN Steam product record; other regions are checked separately.
Checked:
Supports: Steam appdetails type=game identifies this standalone base-game app, Product name and explicitly listed operating systems
CN / CNY · Steam · This exact edition and purchase conditions only.
Latest recorded price: CNY 33.60 on Oct 20, 2026, 05:02 PM UTC; unchanged compared with the preceding observation on Oct 20, 2026, 01:17 PM UTC.
Dots are observations, not a continuous record. Prices between observations are unknown.
CNY 33.60 lowest in the displayed observations, from Oct 20, 2026, 01:17 PM UTC to Oct 20, 2026, 05:02 PM UTC.
| Observed at (UTC) | Price |
|---|---|
| Oct 20, 2026, 01:17 PM UTC | CNY 33.60 |
| Oct 20, 2026, 05:02 PM UTC | CNY 33.60 |