OpenGameArt.org
Rightful Lord of Costa del Paradis
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"Rightful Lord of Costa del Paradis" by Spring Spring licensed CC-BY 4.0: https://opengameart.org/content/rightful-lord-of-costa-del-paradis Author's attribution notice: Spring
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.