Custom Card Game Rules Online — Riot Lab House Rules Builder
Build your own house rules. Free in your browser, no download.
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Riot Lab
Build your own house rules
About Riot Lab
Riot Lab: Build your own house rules. Party modes change every day or week, or let friends share one device, with daily challenges that keep your streak alive.
What you can change
- Players (2–4), hand size (3–12) and AI difficulty
- Stacking, cross-stacking, 7-0, draw until playable, Crazy Eights, shields, the Riot Meter, turn timer, teams
- The Merciless, Eclipse and Eruption packs and Anything Goes
- Web house rules: Jump-In, Last Card Call and Doubles
- Share your rules as a link — friends open the exact same table
Rule guides for this mode
Frequently asked questions
Is Riot Lab free to play?
Yes. Riot Lab and every other Prism Riot mode are free in your browser with no download, no sign-up and no account. Progress is saved in your browser.
Can I play Riot Lab offline?
Yes. After your first visit Prism Riot works offline — add it to your home screen from the browser menu and it opens like an app.