Online Play
Play remote matches through a browser-based simulator designed to make tabletop-style gameplay easier to access.
About Cardboard Kitsune
An online tabletop space for Union Arena players.
Cardboard Kitsune is an unofficial online simulator and community platform built for players who want a convenient way to practice, test decks, and enjoy games with friends from anywhere.
What Cardboard Kitsune does
Cardboard Kitsune provides digital tools for playing, practicing, and organizing games online. The platform includes features such as online matches, deck building, ranked play, community events, and player-focused tools designed to make remote play easier.
Our goal is to create a smooth, accessible play experience for the community while keeping the simulator free to use. Players can explore decks, learn interactions, connect with others, and enjoy the game in a digital space built around convenience and community.
Deck Tools
Build, manage, and test decks digitally so players can practice ideas before bringing them to in-person games.
Community Events
Support for hosted events, casual play, and organized community activity gives players more ways to connect.
Free Access
Core gameplay features are free to use. Optional community and cosmetic features may exist, but gameplay access is not locked behind purchases.
Unofficial fan-made project
Cardboard Kitsune is an independent, unofficial fan-made simulator. It is not affiliated with, endorsed by, sponsored by, or officially connected to Bandai, Bandai Namco, Shueisha, Union Arena, or any related rights holders.
All trademarks, card names, game names, artwork, logos, characters, and related intellectual property belong to their respective owners. Cardboard Kitsune exists as a community tool for players and does not claim ownership of official game materials.
How the site is supported
Cardboard Kitsune may display advertising on public informational pages to help support hosting, development, and maintenance costs. Ads are not intended to appear on gameplay, deck builder, item shop, support, account, or other sensitive app areas.
This helps keep the core simulator accessible while separating advertising from the parts of the site that involve active play, account support, or deck-building tools.
Questions or feedback?
We welcome bug reports, community feedback, and questions about the platform. For account, privacy, or policy-related requests, please contact us directly.
Contact SupportCardboard
Kitsune
The world's first simulator for the Union Arena trading card game.
Cards generously provided by
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2026 Cardboard Kitsune. All Rights Reserved
