"Does it mean there is no moon when I am not looking at it?" This famous line is often attributed to Einstein as a question about quantum mechanics. "CASSETTE BOY" is a puzzle action RPG featuring the "Schrodinger System," inspired by quantum mechanics and based on the idea that what you do not see does not exist. Now, set out on an adventure to collect the fragments of the moon and save the world. "CASSETTE BOY" is a puzzle action RPG inspired by concepts of quantum mechanics, exploring a world where existence disappears when you are not looking. It may look like retro pixel art, but the world is actually built in 3D, and you rotate the screen to control what is visible and what is not, solving puzzles through action-based gameplay. In addition to the main story, the game includes randomly generated dungeons, minigames, and numerous hidden elements, offering plenty of side content and depth. The idea that unseen things do not exist means that, for example, if an obstructing character or monster stands in your way, you can rotate the screen to hide it behind a wall. It will not only become invisible but will also cease to exist. In other words, the player can erase obstacles and move forward. You can also erase other gimmicks, such as switches or even arrows you have fired. You will need to think in new ways to solve the puzzles, creating a completely new kind of puzzle experience. This title won the VERMILION GATE AWARD at BitSummit Drift 2024 and was selected for Tokyo Game Show 2024 "Selected Indie 80," attracting strong attention within Japan's indie scene. At first glance it may look like a retro game, but both the puzzles and the world offer a completely new and innovative puzzle RPG experience. Number of players: 1. CERO rating: All Ages.