One-stop card game development toolbox: visual design, instant testing, AI assistance, and code extension—build your own trading card game solo.

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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?

“BOSS KEY is not only a card game but also a card game editor. Therefore, we need extensive user feedback to optimize functionality and ensure the software progresses in the right direction.”

Approximately how long will this game be in Early Access?

“We expect this process to last until the software’s functionality satisfies most users—approximately one to two years.”

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

“We plan to support more card game genres, provide richer customization options, create more detailed software tutorials, enhance visual effects, fix bugs, and add support for more languages.”

What is the current state of the Early Access version?

“Currently, the software is already functional for creating classic CCG/TCG games. We have also included official examples in the 'Workshop', allowing users to directly engage in classic CCG/TCG battles. This helps users get a preliminary understanding of the software’s capabilities or create custom content based on these examples.”

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

“We plan to gradually increase the price as new content and features are introduced.”

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

“For Chinese users, we have established a QQ group for discussions. Non-Chinese users can provide feedback or suggestions through the Steam Community discussion board."”
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About This Game

About This Software

This is a one-stop development toolbox built specifically for card games. We've encapsulated the underlying technology into intuitive visual modules, so you can complete the entire workflow—from card design and data configuration to gameplay testing—in minutes, with no programming background required. With built-in smart templates and real-time preview, a single person can quickly turn ideas into playable trading card games.

Whether you're a player who loves DIY content and enjoys creating and sharing custom cards, or an indie card game developer, designer, or small development team, you'll find an efficient path to bring your ideas to life here.

Core Features

  • Rapid Prototyping
    Complete card design and creation in minutes—no programming background needed. Build playable prototypes through visual operations alone.

  • Deep Customization
    Freely define card attributes, skill logic, game modes, and even entirely new rules. Whether you're fine-tuning or rebuilding from scratch, it's all within reach.

  • Instant Testing & Validation
    Game logic is automatically constructed from your configuration data. Test gameplay inside the software at any time to quickly validate your design ideas.

  • Code Extension Capability
    Beyond visual editing, the software also supports using code to extend both the game and the editor. You can write custom logic and add new feature modules to break past the limits of visual tools and implement more complex gameplay and systems.

  • AI-Assisted Operations
    The editor supports AI-assisted operation, using intelligent assistance to handle repetitive configuration, content generation, and editing tasks—further boosting development efficiency.

  • Seamless Content Sharing
    Integrated with the Steam Workshop, publish your creations and get direct player feedback to continuously refine your content.

  • Complete Technical Empowerment
    Source code licensing and technical support are available, significantly reducing development costs and timelines—especially friendly to individuals and small teams.

From Idea to Playable, in Just Four Steps:

  • Design Cards — Define attributes, skills, art, and sound effects in the Card Editor

  • Configure Data — Build structured content like modes, classes, and levels through the Data Manager

  • Test Gameplay — Logic is automatically constructed from your configuration; playtest inside the software anytime

  • Publish & Share — Upload to the Steam Workshop with one click, gather player feedback, and iterate

The entire process is visual—no code required. Advanced users can also extend with code or use AI-assisted editing for repetitive tasks.

You Can Also Use It To

  • Set up rooms with friends to play custom card games or board games

  • Collaborate remotely or demo your game ideas to others

AI Generated Content Disclosure

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

This game utilizes generative AI to create art assets, which are primarily used for the store page background and the card examples in the workshop.

System Requirements

    Minimum:
    • Requires a 64-bit processor and operating system
    • OS: Windows 10 / 11 (64-bit)
    • Processor: Intel Core i3-4130 or AMD FX-4350
    • Memory: 8 GB RAM
    • Graphics: Intel HD Graphics 4600, NVIDIA GeForce 710, AMD Radeon R5 230 (OpenGL 3.2 Support)
    • DirectX: Version 11
    • Network: Broadband Internet connection
    • Storage: 8 GB available space
    • Sound Card: DirectX Compatible
    Recommended:
    • Requires a 64-bit processor and operating system
    • OS: Windows 10 / 11 (64-bit)
    • Processor: Intel Core i5-7500 or AMD Ryzen 3 1200
    • Memory: 16 GB RAM
    • Graphics: NVIDIA GeForce GTX 650 Ti, AMD Radeon HD 7850 or better
    • DirectX: Version 11
    • Network: Broadband Internet connection
    • Storage: 16 GB available space
    • Sound Card: DirectX Compatible
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