PolyAlien Review — A free one-page TTRPG where aliens in humansuits infiltrate Earth — built for quick one-shots and low-prep play

PolyAlien is a free, rules-light, one-page tabletop roleplaying game about aliens hiding in humansuits who must infiltrate human society without blowing their cover. The premise is deliberately absurd and comedic — players choose from alien archetypes (each with two stats and a signature move), collaborate on a shared mission, navigate human social scenes with improvised alien logic, and manage suit glitches that escalate chaos. A full session runs 60–120 minutes, requiring no prior TTRPG experience. The entire game is distributed as a free PDF download in English and French, and is readable online. The system is purposefully minimal: there are no complex skill trees, no long character backstory requirements, and no heavy GM prep — the built-in prompt tables handle most of the session scaffolding. PolyAlien is explicitly designed for conventions, online one-shots, game jams, and weeknight groups. The site includes an online reader (no PDF download needed) and links to Joachim Mouffron's broader design network.

TTRPG beginners, convention attendees, game jam participants, and groups who want immediate play without heavy prep

Bilingual (EN/FR) one-page format optimised for convention demos and jam play eliminates prep and rulebook overhead entirely

Joachim Mouffron is a French fullstack developer, game designer, and creative technologist who has published multiple TTRPGs and web-based game tools. He is the creator of Nowhere Land (The Null Handbook), Alcaphaz (ESP Brain System), 3B (Blocus, Boycott et Brigades), and several World of Darkness character builders. His game design philosophy centres on accessibility, clarity, and the intersection of technology and tabletop narrative.

PolyAlien is a free, openly available TTRPG created by Joachim Mouffron, a designer with a verifiable and extensive body of published work. The PDF is hosted directly on the domain, readable in-browser, and carries no payment wall, no data collection, and no subscription. The game is licensed under a permissive creative commons framework consistent with the broader open TTRPG community. Zero commercial risk, zero scam likelihood.

Groups wanting a quick, funny, zero-prep TTRPG session; first-time players being introduced to tabletop RPGs; convention organisers looking for a short-demo game; game jam participants (the minimal format is ideal for jam constraints); and French-speaking groups appreciating the bilingual PDF.

Completely free. The PDF is available without registration and is downloadable in English and French. The online reader is also free. No Kickstarter, no premium tier, no Patreon gate — pure open-access game design.