Digimon World's evolution code decoded: a missing 'break' shaped 25 years of outcomes

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A community decompilation project has reconstructed the evolution logic from the 1997 PlayStation game Digimon World, revealing the actual rules behind its famously opaque evolution system. A loop without a 'break' statement causes the game to select the last highest-ranked stat in its array when multiple stats are tied, establishing a hidden priority order of brain over speed, defense, offense, MP, and HP. The scoring system awards points based on care mistakes, weight, stat thresholds, and bonus conditions, with a candidate needing at least three out of four points to be eligible for evolution. Notably, care mistakes are not purely a penalty — certain evolution paths require neglect above a threshold to qualify. For Champion-level evolutions, only the single highest stat is evaluated, making the tie-breaking bug especially consequential for those outcomes.

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