口口口口

口口口口 / Hollow Four

About the Game

口口口口 (Hollow Four) is an exploration puzzle platformer with a minimalist white-box pixel art style. Here, there are no tense chases, no fierce battles—only relaxing exploration and clever puzzles.

In this game, you play as a special character made up of four squares—a doorpost entity that was supposed to take its place in the scene. Due to a sudden system crash, you've lost most of your collision bodies, gaining the unique ability to pass through walls and clip through obstacles. Using this "bug" as a feature, you must climb layer by layer through the stack world, retrieve your lost collision fragments, and become whole again to fulfill your mission as a doorpost.

Story Background

This is a story that takes place deep within the code world.

You are "Four Squares," a doorpost entity made of four blocks. Just as you were about to take your position in the scene and fulfill your duties as a doorpost, everything suddenly stopped—the computer crashed.

In the darkness, time seemed to stand still.

When the system rebooted, you found yourself fallen to the deepest depths of the coredump stack. Fortunately, your sprite is intact—you are still you. Unfortunately, of your four collision bodies, only one remains. The other three are scattered somewhere in the stack.

Without collision bodies, you've become a "ghost-like" existence—you can pass through walls and ignore physical rules. What was originally a bug has now become your only hope.

You need to go upward, layer by layer through the stack, to retrieve your lost collision fragments, become whole again, and return to where you belong.

This is a journey of self-repair and a wonderful exploration of the underlying program world.

Design Philosophy

口口口口 is deeply inspired by "Öoo". I wanted to create a gaming experience without pressure, without chasing, and without demanding precise controls. Players can freely explore, think slowly, and enjoy the fun of puzzle-solving in a relaxed and pleasant atmosphere.

The game's core mechanic revolves around the unique concept of "missing collision bodies." You need to use your clipping ability, along with the collision bodies you gradually recover, to solve various puzzles. With each collision body recovered, your abilities change, bringing new possibilities to puzzle design.

The minimalist white-box pixel art style is not just a choice under technical constraints, but also echoes the "program world" theme. In this pure geometric world, every square and every line has its meaning.

About Development

This is my first game project.

From the initial idea to the final completion, the process was full of challenges and surprises. Originally, I designed more levels and more mechanics, but due to time constraints and some unexpected circumstances, much content has yet to be presented. Nevertheless, I am still very happy to have completed this work and to share it with everyone.

Most of the game's content—art, music, and code—was completed by me alone. This has been a long and fulfilling learning journey.

Acknowledgments

I could not have completed 口口口口 without the following excellent open-source projects and resources:

• Godot Engine

  A powerful and friendly game engine that makes indie developers' dreams come true.

• fusion-pixel-font

  Provided beautiful pixel font support for the game.

• go-noto-universal

  Enabled broader text display support for the game.

• m6x11plusPLUS

  An exquisite pixel font that added unique style to the game.

• "template - animated character" from lotovik

  Provided valuable reference for character animation.

• jsfxr

  A simple yet powerful sound effect generation tool.

• Pixabay

  A rich library of free music resources.

At the same time, I want to pay tribute to "NamaTakahashi," the creator of "Öoo". Öoo demonstrates the infinite possibilities of indie games, and its design philosophy has deeply influenced me.

Thank you to every player willing to try this game.

This is my first step, and also a new beginning.

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Made by: inno

October 2025