ありがとう

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"ありがとう" by Terrazon licensed CC-BY 3.0: https://opengameart.org/content/%E3%81%82%E3%82%8A%E3%81%8C%E3%81%A8%E3%81%86

Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.