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https://opengameart.org/content/9-explosion-sounds: This work, made by Unnamed (Viktor.Hahn@web.de), is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License. http://creativecommons.org/licenses/by-sa/3.0/
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https://opengameart.org/content/bell-sounds: By Marcelo Fernandez under the CC-BY 3.0
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https://opengameart.org/content/fleshy-fight-sounds: Additional Sound FX by Will Leamon under the OGA-BY 3.0
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https://opengameart.org/content/sci-fi-laser-fire-sfx: K.L.Jonasson, Winnipeg, Canada. Triki Minut Interactive www.trikiminut.com under the CC-BY 3.0, CC-BY-SA 3.0
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https://opengameart.org/content/5-break-crunch-impacts: By Independent.nu under the CC0 (Public Domain)
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https://opengameart.org/content/different-steps-on-wood-stone-leaves-gravel-and-mud by TinyWorlds under the CC0 (Public Domain)