Hello Mapcore, it's been awhile. I actually released this mod a few months ago I just forgot to post it here.
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Keys is a Source mod, you just need the 'Source SDK Base 2013 Singleplayer' installed to play it. Download it over on ModDB or directly from the main site.
Also you can get the fantastic original soundtrack by Logs From Borland over at Bandcamp right here. It's a pay-what-you-want and features more tracks than I was able to use in the mod.
I hope you all enjoy it.
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