How to use this guide
Each entry gives the world, the Earth-rule it breaks, the rule it runs on instead, the result, key data, and full field notes. Click any entry to open its notes.
On "other rules"
"Impossible" almost always means "impossible by Earth's defaults." These worlds aren't failed Earths; they run on other physics, other chemistries, other orientations — and thrive. Different rules, not broken rules.
On the diagrams
Each diagram is the world itself, drawn with the feature that defines it — an ocean under ice, a sideways tilt, a plume to space. Same frame each time; each world unmistakably its own.