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Can I use your free 2d sprites in my game and export it to Google Play Store
Yes, you can see their license on the assets page.
But for Unity Asset Store, you are entirely free to do anything.
There are numerous websites, search on google for free 2d sprites.
Such as Opengameart: https://www.google.com/url?sa=t&source=web&rct=j&url=https://opengameart.org/&ved=2ahUKEwjO3dKnp4vuAhXc73MBHX_sB5wQFjADegQIFBAB&usg=AOvVaw1cO_MQvF2KZd_jdl0Q9Ci5
or even Unity Asset Store
Can I use them in my game that I can export Google Play Store
your answer . working = true;
Yes you can.