Click-Sound von TicTacShutUp (bearbeitet)
https://freesound.org/people/TicTacShutUp/sounds/406/
Attribution 3.0 Unported (CC BY 3.0)
Correct Choice-Sound von unadamlar
https://freesound.org/people/unadamlar/sounds/476178/
CC0 1.0 Universal (CC0 1.0)
Public Domain Dedication
Wrong Choice-Sound von unadamlar
https://freesound.org/people/unadamlar/sounds/476177/
CC0 1.0 Universal (CC0 1.0)
Public Domain Dedication
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