Go to steam page for Undertale.

Hover your mouse over the game in your library and select "Properties"

Once you are in properties, scroll down to the "betas" category.

Enter "Private Betas" code: "xxx_IAmGullible_xxx" and click check code.

Click the build of "10th_anniversary_build_010" and then close the window.

Run the game and enjoy.
#undertale #10thanniversary #undertale10 #undertale10anniversary #undertale10thanniversary #tobyfox
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