Build your world. Keep the engine.
StoryRig is a ready-made base for narrative Worlds where consequential rolls change the situation. It already provides 10+ / 7–9 / 6− resolution, Position and Effect, a dynamic character sheet, character creation, Core Moves, Conditions, Resource Tracks, Threats, Progress Tracks, Equipment, and AI-GM procedures. Creators mainly replace the stats, signature Moves, Archetypes, consequences, and growth that give a setting its identity. It fits romance, mystery, academy, horror, heists, survival, and character-driven adventure especially well. If tactical combat grids, exact weapon math, or deep build optimization are the main attraction, start from a crunchier system.
Edit the existing StoryRig Core System Profile in place, then replace the sample content as your World takes shape. The Builder's Manual includes a fit check, genre recipes, clone-safe order, and a pre-publish checklist. The Last Platform is a mechanics test, not a setting seed; delete it once your own Game Start is ready.