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Is the moon still there when I'm not looking at it?
If it isn't...will the people I love disappear if I stop looking at them?



"Do you really believe the moon isn't there when you're not looking at it?" This famous quote attributed to Einstein poses a profound question about quantum mechanics. This game is a puzzle adventure inspired by quantum mechanics, set in a world where things cease to exist when you're not looking at them. Manipulate existence and solve the mysteries of this intriguing world!

About Cassette Boy:
Cassette Boy looks like a 2D game, but its world is actually 3D.
In order to solve its puzzles, you will have to turn and twist the map around, changing the perspective.
Things that you can't see from your perspective, for example because they're hidden behind a wall, stop existing—this is called the "Schrödinger system."
Hide obstacles out of sight and out of mind or reveal secret passages to advance through the game.
Of course, solving puzzles won't be enough. You'll have to pick up weapons and face monsters and bosses as well.
Enemies, puzzles, and more await you in this mysterious world!


-The Schrödinger System-
The state of matter is only defined once you observe it.
In Cassette Boy's world, what you can't observe doesn't exist. In other words, the only thing that matters is what you can see on the screen.
Yes, even the people you just talked to. They don't exist unless you're observing them.
Flip the world around and bring things in and out of existence.