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Toby Fox Explains Why Undertale and Deltarune Remain Officially Only in English and Japanese

He says official versions must match his own checks, making wider localizations unworkable for now.

Overview

  • Fox, who posted the explanation on Bluesky on Sunday, responded to fresh criticism from Latin American fans after he promoted a new Japanese translation of the cult game OFF.
  • He says he will only approve translations he can personally verify to ensure the writing and wordplay match his vision, which limits official releases to English and Japanese.
  • For Deltarune, he says adding more languages is not feasible right now because supporting them would slow development and push back releases.
  • He says he explored options with publisher 8-4 but nothing has worked so far, and he may try a different approach in the future.
  • He welcomes unofficial PC fan translations as a helpful stopgap and rejects claims of bias against regions, noting separate frustrations over tour stops and merchandise shipping.