1up.com listed on supported sites but returns unsupported URL error

[egerber95]

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• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.04.25. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• [x] I've verified and I assure that I'm running youtube-dl 2018.04.25

Before submitting an issue make sure you have:

• [x] At least skimmed through the README, most notably the FAQ and BUGS sections
• [x] Searched the bugtracker for similar issues including closed ones
• [x] Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• [x] Bug report (encountered problems with youtube-dl)
• [ ] Site support request (request for adding support for a new site)
• [ ] Feature request (request for a new functionality)
• [ ] Question
• [ ] Other

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The site 1up.com is listed under the supported sites, but videos that are hosted on the site itself return an unsupported URL error.

Tried with this URL: http://www.1up.com/reviews/sly-4-review.html

[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'http://www.1up.com/reviews/sly-4-review.html']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.04.25
[debug] Python version 3.5.1 (CPython) - Darwin-17.4.0-x86_64-i386-64bit
[debug] exe versions: none
[debug] Proxy map: {}
[generic] sly-4-review: Requesting header
WARNING: Falling back on generic information extractor.
[generic] sly-4-review: Downloading webpage
[generic] sly-4-review: Extracting information
ERROR: Unsupported URL: http://www.1up.com/reviews/sly-4-review.html
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 789, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 440, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 3166, in _real_extract
    raise UnsupportedError(url)
youtube_dl.utils.UnsupportedError: Unsupported URL: http://www.1up.com/reviews/sly-4-review.html

[parth-verma]

1up.com is incorrectly listed as supported as only the subdomain gamevideos.1up.com is supported.