My name is Athenodora and I am a member of the SCP wiki's Licensing Team. While you're perfectly free to make SCP games (commercially or otherwise), we would like to ask that your project is brought into compliance with the wiki's Creative Commons license. This is NOT a takedown notice.
The SCP Foundation wiki and all unique concepts and terms associated therewith are licensed under Creative Commons Attribution-ShareAlike 3.0 (explained further http://creativecommons.org/licenses/by-sa/3.0/ here); this means you are legally free to use them, but your use of them must also abide by the terms of the CC-BY-SA 3.0 license.
Specifically, in your game's description there should be a linkback to the SCP wiki, a link to the originating article if you're using content from a specific SCP or Tale, and a listing of the author of that article. You can find the author of an article by looking at the page itself, scrolling down and clicking "History". Look for the earliest edit, and the username associated with that edit.
Here's an example of the proper attribution regarding a game which references no specific wiki pages: "Content relating to the SCP Foundation, including the SCP Foundation logo, is licensed under Creative Commons Attribution-ShareAlike 3.0 and all concepts originate from http://www.scp-wiki.net."
And here's an example of the proper attribution regarding a game which references, in this example, SCP-682: "Content relating to the SCP Foundation, including the SCP Foundation logo, is licensed under Creative Commons Attribution-ShareAlike 3.0. All concepts originate from www.scp-wiki.net; SCP-682 was written in 2008 by Wikidot user "Dr Gears" and can be found here: http://www.scp-wiki.net/scp-682 "
If you want to learn anything else about our licensing policy, you can look here for more information: http://www.scp-wiki.net/licensing-guide . We have specific and different guidelines with regards to works featuring SCP-111, SCP-173, and SCP-1926. If you plan to use either art or text from those articles, be sure to look at the licensing guide first. You can also send us an email firstname.lastname@example.org, or chat with us directly at http://05command.wikidot.com/license-experts-main if you have any further questions.
Thank you very much,Athenodora