GATEWAY RPG: The Free Rules Lite d20 Game System

The FREE Universal Bridge to Tabletop Roleplaying Adventure

Overview

[h1]Get your table playing in minutes, not hours.[/h1]   GATEWAY RPG is a free, modular d20 system designed for zero-prep adventures, sudden one-shots, and seamless intro sessions. Powered by familiar 5E mechanics but stripped of all the bloat, GATEWAY lets you run any genre instantly: from neon-soaked cyberpunk streets to grit-filled noir alleys.

What’s Inside?

The 42-Page Core Rulebook: A streamlined engine for Players and GMs, available in both English and Spanish (Reglas en Español). The Deluxe Edition: The definitive 102-page PDF compiling the Core Rules, Solo Rules, and Bestiary into one volume. Accessible Formats: All rules are formatted in high-quality, printable PDFs with options for both white and book-textured backgrounds. Ready-to-Play Content: Jump straight into the action with Pre-generated Characters and One-Shot Adventure Modules spanning multiple genres. The Player’s Toolkit: Includes printable and form-fillable Character Sheets, a 1-page Quick Reference sheet, and a dedicated d20 Oracle for Solo Play. Starter Bestiary: A multi-genre supplement featuring 25 adversaries across 11 settings, from High Fantasy and Space Opera to Cthulhu-style Horror. Universal Compatibility: Use the Advanced Play Variant for long campaigns or easily port your characters into D&D, Pathfinder, or Star Wars d20. Homebrew & Variant Rules Supplement: Level up your game with 20+ pages of optional mechanics. Features include "Spark of Heroism" (Inspiration), Pushing for Success (Partial Success), and Genre Modifiers for high-tension Survival or Cosmic Horror play. Pocket-Sized Character Sheets: Compact sheets designed for portability and efficiency. Solo Play Quickstart Zine: A portable, zine-style guide for quick, on-the-go solo adventures.

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