Dysnomia is much darker than Eris, with a low albedo, and is significantly smaller—estimates place its diameter in the low hundreds of kilometers depending on assumed reflectivity. The contrasting albedos of Eris and Dysnomia suggest different surface compositions or evolutionary histories: Eris’s bright, volatile-rich exterior versus Dysnomia’s darker, likely more primitive surface.
Due to the game’s niche appeal, the fan community has created open-source engines that replicate the mechanics of Eris Dysnomia . While these aren't the official game, they offer similar gravity-based puzzles for free. Projects like or "Dysnomia Engine" are 100% legal free downloads. Eris Dysnomia Free Download