Planned Release Date: June 2026

About This Game

"Ctrl+Z" is a novel puzzle & story game where you use a limited "Ctrl+Z (Undo 1 Step)" function to fill in every tile on the board.

Break through a variety of gimmicks—like floors you slide across, tiles that must be stepped on a specific number of times, and warp tiles—using the power of "Ctrl+Z," and guide the story to a happy ending!

◆ A New Kind of One-Stroke Puzzle Driven by Ctrl+Z!

Ctrl+Z is a puzzle game where the goal is to clear the board by filling in all the tiles. However, you aren't just tracing a simple path.

You are granted the magic button "Ctrl+Z," which allows you to undo your movement and go back one tile.

◆ A Massive 100 Stages & a Deep Story

Features 100 stages with gradually increasing difficulty.

As you progress through the puzzles, the story unfolds.

Depending on your playstyle (such as your reset count and perfect clear completion), the diary entries, episodes, and endings you unlock will change.

Can you uncover every mystery and reach the "True Ending"?

◆ Calculate Your "Undos" to the Absolute Limit

Each stage has a strict maximum number of times you can use Ctrl+Z (Undo).

It's not just about avoiding dead ends; where you choose to use Ctrl+Z is the ultimate key to victory.

Challenge yourself with a puzzle experience that defies common sense!

◆ Designed for Everyone: From Beginners to Completionists

Assist Mode: If you get completely stuck, turning on Assist Mode activates a "Hint Feature" that highlights part of the correct route based on your reset count. Even if you aren't great at puzzles, you can enjoy the game all the way to the ending!

(The hint feature displays the most understandable path from the possible correct routes. The hints will gradually increase, but the entire route to the goal will never be fully revealed, keeping it fun until the very end!)

(Text hints are also available!)

Perfect Clear: In addition to the progressively challenging stage design, there are completionist elements for clearing stages while keeping resets to an absolute minimum! We await the challenge of puzzle veterans.

About the Story

◆ A Tale of a "Gentle Hell" and "Small Salvation" Found in Everyday Life

An unchanging Sunday.

My best friend Suzu-chan and I snuck into the room of my older brother, who was "always perfect."

What we found there was his "secret base," locked away by 100 puzzles.

"I wonder if the reason my brother changed is in here..."

A shadow lurking behind innocent everyday life.

An empty room with nothing but cardboard boxes and a futon.

That "bottomless anxiety" everyone has felt at least once during childhood.

"Do you have a past you want to do over?"

"Have you ever felt a wall between yourself and your family, friends, or someone important to you?"

A story of small salvation, dedicated to you, living in an unreasonable "reality" that cannot be undone.

The story progresses by solving puzzles, taking the place of traditional riddles or exploration.

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・ 3 Endings

・ 2 Special Episodes

・ Story Content: "Brother's Diary"

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■ Streaming & Let's Plays Welcome!

Please be sure to include the Steam URL for Ctrl+Z in the description of your video or stream.

Monetization is perfectly fine!

If you tag or contact our official X (Twitter) account, the developer will gladly come watch!