
Party of Four - AI Game Master for Claude, solo or with friends
Published 6 October 2026 · On Quisicosas since 10 October 2026
Featured in the newsletter of
10 October 2026 (on Substack)
What it is about
HALLOWEEN SALE until Nov 4: Campaign Keeper, Grandpa's Island and Party of Four - 65% off each, or all three together for € 3,99 https://itch.io/s/205562/halloween-sale-2026 PARTY OF FOUR An AI Game Master for Claude: solo, with friends around one phone, or with your kids at the kitchen table. No group? No problem. Party of Four is a Skill for Claude (Anthropic's AI) that turns it into a real Game Master. Each player has a hero; Claude runs the world, and AI companions with their own personality, voice, goals and fears fill the empty seats. There are always four at the table. It has been playtested at a real table: by voice, with friends, and with a 7-year-old. Everything below comes from those games. PLAY WITH FRIENDS AROUND ONE PHONE • Up to 4 players. Say your name, then what you do: "Sara: I climb the tower." • Claude keeps track of who is who, gives everyone the spotlight and goes in turn order during fights. • Put the chat on a TV or PC as the story board while you talk into the phone. THE GAME MASTER TALKS • Say "we're playing by voice": Claude sets everything up, then you switch on Claude's voice mode and play hands-free. • Short spoken turns, a clear question at the end of each one, dice results read out the same clear way every time. • Real dice even by voice: before you start, Claude fills a coded "dice bag" of real random rolls and uses them in order. No peeking, no invented numbers. FAMILY MODE AND KIDS MODE • Family tone: no gore, nobody dies, danger is exciting but never scary. • With young kids at the table, turns get very short, something happens every turn, and kids get things to do for real: make the sound of the wind, roar like the dragon, invent the magic word. • Kids roll a real die, even an ordinary six-sided one. At the end, every hero gets a title. REAL RULES, NEVER INVENTED • Simple d20 rules, or your favourite system. Claude rolls real random dice with code, or you roll your own. • At every roll Claude reminds you of your hero's numbers. Say "sheet" anytime to see or hear your full sheet. • Signature abilities, Luck points, partial successes, and an oracle for open questions ("Is anyone inside?"). ANY WORLD, ANY LANGUAGE, NEXT WEEK TOO • Classic or dark fantasy, pirates, gothic mystery, sci-fi, post-apocalypse, or your own idea. • Plays in your language: English, Italian, Spanish, German… • End a session and get a "Previously on…" recap plus a SAVE block. Paste it into a new chat and the story continues. WHAT YOU GET • party-of-four.zip: the Skill, ready to upload to Claude • Quick Start PDF: install in 2 minutes, how to start, play with friends, by voice and with kids, save and continue REQUIREMENTS • A Claude account with Skills and code execution enabled. A paid Claude plan is recommended for long sessions. • Works in the Claude app (web, desktop and mobile) and in Claude Code. You upload the Skill once from claude.ai in a browser. • Voice play uses Claude's voice mode; available languages and features depend on your Claude app. TRY BEFORE YOU BUY Free browser demo (sign in to Claude to play): https://claude.ai/artifact/Dc6B3yafRGYKBpnC6aJ4pv Want a taste of the style without Claude? Play The Hollow King, a free voiced gamebook for the table: https://radixitchio.itch.io/the-hollow-king GM FOR A GROUP? Campaign Keeper remembers your campaign and preps your sessions: https://radixitchio.itch.io/campaign-keeper Print your own cards at home with Deck Print (free to use, Pro optional): https://radixitchio.itch.io/deck-print LICENSE Personal use. The stories and characters you create are yours. Please don't share the Skill files. Not affiliated with or endorsed by Anthropic or any game publisher.