Endless battlefields, endless threats from the Overmind army. Grow stronger through retro game cartridges, unleash powerful action, and dive into relentless roguelike combat. In this blend of classic vibes and modern impact, become the last hero to reclaim the planet.

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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“We want to make the game more fun and polished with feedback from gamers around the world.
During this demo and the upcoming Early Access period, your opinions on gameplay feel, inconveniences, bugs, and balance can greatly help shape the final game.
In short, Early Access is a process for growing together with the community to create the best possible game.”

Approximately how long will this game be in Early Access?

“The Early Access period is currently planned for about 3–4 months, starting with Early Access in November 2025 and aiming for a full release in March 2026.
During this time, we will actively incorporate player feedback and data to improve game content and balance.”

How is the full version planned to differ from the Early Access version?

“In the current Early Access version, you can play through Chapters 1–3, experiencing about 10 hours of content.
The full version is planned to include roughly 20 new weapons and upgrades, all chapters leading to the ending, a variety of unique enemy units and patterns, and creative enemy growth elements.
Please note that the final content and scope of updates in the full version may change depending on player feedback and development circumstances.”

What is the current state of the Early Access version?

“The current version has all core combat, exploration, and growth systems working, allowing about 10 hours of play through Chapter 3.
You can fully experience the core gameplay and combat feel, though balance adjustments and bug fixes are still needed.
We plan to expand the content and refine growth systems and enemy patterns based on player feedback.”

Will the game be priced differently during and after Early Access?

“As new content and features are implemented and the game’s value increases, we plan to raise the price for the full release.”

How are you planning on involving the Community in your development process?

“Our goal is a game that grows together with the community.

- We collect feedback through Steam forums and Twitter (X) and actively reflect it in development
- We accept reports of inconveniences, balance issues, and ideas from play experiences
- Before the full release, we will use user participation events and surveys to help prioritize updates
Every single opinion can have a significant impact on the final game’s direction and fun. Even though we are a small team, think of this as a co-growth project with players.”
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About This Game

🎮 A New Experience in Sci-Fi Action Roguelike

Retroid: Cartridge Protocol combines fast-paced combat, unpredictable enemies, and the thrill of progression into a high-quality sci-fi roguelike experience. Every run offers new battles and strategic choices, keeping the challenge fresh and immersive.

📘 Lore

Once overshadowed, Dr. Victor stole Dr. Evelyn’s groundbreaking technology out of envy, creating the Overmind army to seize control of the planet. As Prototype Zero-One, you are the only one who can unlock the hidden power within the cartridges and reclaim the world.

⚔️ Features

  • Unpredictable battles – Enemy evolutions create new combat patterns every run.

  • Simple yet deep controls – Outsmart foes and map traps with melee strikes and precise dashes.

  • Progress through exploration – Permanent and temporary upgrades fuel long-term growth.

  • Detailed sci-fi design – Immerse yourself in a richly crafted futuristic world.

Find every cartridge. Unlock your final evolution.


Take back the planet from the Overmind army.

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

All in-game content is developed in-house by the developer.
For certain in-game content, when newly acquiring retro game cartridges, installation videos generated by AI and post-processed are played.

System Requirements

    Minimum:
    • Requires a 64-bit processor and operating system
    • OS: Windows 10 64bit
    • Processor: Intel Core i3-3210
    • Memory: 4 GB RAM
    • Graphics: DX11, DX12
    • DirectX: Version 11
    • Storage: 1200 MB available space
    • Additional Notes: Requires 64-bit processor and operating system
    Recommended:
    • Requires a 64-bit processor and operating system
    • OS: Windows 10 64bit
    • Processor: Intel Core i5-4690 or higher
    • Memory: 8 GB RAM
    • Graphics: NVIDIA GeForce GTX 660 or higher
    • DirectX: Version 11
    • Storage: 1200 MB available space
    • Additional Notes: Requires 64-bit processor and operating system

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