Publishing of puzzle action RPG "Cassette Boy" handled by Pocketpair. Set in a world inspired by quantum mechanics where "things don't exist if not observed."
Note: the original Japanese article can be found at:
https://www.4gamer.net/games/703/G070383/20251029003/
Editorial Department: Akasaka | 2025/10/29 02:42 (UTC)
Today (October 29, 2025), Pocketpair’s publishing label “Pocketpair Publishing” announced that it will handle the PC (Steam) publishing of “CASSETTE BOY,” a puzzle action RPG developed by Wonderland Kazakiri. The game is scheduled for release within 2025.
This game is a puzzle action RPG set in a world inspired by quantum mechanics—where “things do not exist if not observed.” It features the “Schrödinger System,” which causes objects outside the player’s view to cease existing.
Players rotate the screen to make obstacles disappear or create secret passages, advancing through the game. Beyond solving puzzles, players must sometimes acquire weapons and face monsters and bosses.
Pocketpair Publishing announces its fifth title: “Cassette Boy”! An adventure puzzle action RPG set in a world where “things don’t exist if not observed”!
We are pleased to announce that Pocketpair Publishing, the publishing label of Pocketpair Co., Ltd. (Headquarters: Shinagawa-ku, Tokyo; CEO: Takuro Mizobe), will publish the Steam version of CASSETTE BOY / Cassette Boy, a puzzle action RPG developed by Wonderland Kazakiri Inc., based in Tokyo.
About CASSETTE BOY / Cassette Boy
“So the moon doesn’t exist when I’m not looking at it?”
This famous quote is attributed to Einstein questioning quantum mechanics.
This game draws inspiration from that concept—creating a puzzle action RPG set in a world where things vanish when unseen. Manipulate existence itself and unravel the mysteries of this strange world!
Twist and Rotate the World
At first glance, CASSETTE BOY / Cassette Boy appears to be a 2D game, but its world has a more complex structure. To solve puzzles, players must rotate or twist the map to change their perspective.
For example, objects hidden in shadows—out of the player’s line of sight—are erased from existence. Use this mechanic to hide obstacles out of view or create secret pathways by making them “exist” only when observed. Solving puzzles isn’t enough—you’ll also need to acquire weapons and confront monsters and bosses. Challenge yourself against enigmatic puzzles and terrifying foes in this mysterious world!
Thumbnail image No.003 / Pocketpair handles publishing for puzzle action RPG “CASSETTE BOY,” set in a world inspired by quantum mechanics where “things don’t exist if not observed” Thumbnail image No.004 / Pocketpair handles publishing for puzzle action RPG “CASSETTE BOY,” set in a world inspired by quantum mechanics where “things don’t exist if not observed”
The Schrödinger System: Manipulating Existence
What is the core of this game—the Schrödinger System? When unobserved, things remain uncertain. In this world, anything not visible—anything outside the screen—is considered non-existent.
That’s right: if someone you just spoke to disappears from view, they cease to exist too. Rotate the screen and manipulate what “exists.”
Thumbnail image No.005 / Pocketpair handles publishing for puzzle action RPG “CASSETTE BOY,” set in a world inspired by quantum mechanics where “things don’t exist if not observed” Thumbnail image No.006 / Pocketpair handles publishing for puzzle action RPG “CASSETTE BOY,” set in a world inspired by quantum mechanics where “things don’t exist if not observed”
The Demo of This Award-Winning Game Is Now Available on Steam!
CASSETTE BOY / Cassette Boy won the Grand Prize at the 2024 BitSummit Awards!
The demo version, Cassette Boy Demo, is now available on Steam.
▼ Download it here:
https://store.steampowered.com/app/2872970/CASSETTE_BOY_Demo/
Experience firsthand the puzzle action RPG where “things don’t exist if not observed”—a game that manipulates what it means to “be.”
Game Overview
Title: CASSETTE BOY / Cassette Boy
Genre: Puzzle Action RPG
Release Date: 2025
Platforms: PC – Steam (Windows, macOS)
Official Website: https://store.steampowered.com/app/2334330/CASSETTE_BOY
Developed by: Wonderland Kazakiri Inc.
Published by: Pocketpair Publishing