The DEMO version only includes 10 pages:
http://htmlgames.com
http://htmlgames.com/Mahjong.html
http://htmlgames.com/Solitaire.html
http://htmlgames.com/Mind-games.html
http://htmlgames.com/Hidden-objects.html
http://htmlgames.com/Match-3.html
http://htmlgames.com/Action.html
http://htmlgames.com/Classic-Games.html
http://htmlgames.com/html5-games-for-your-site.html
http://htmlgames.com/buy-html5-games.html

It is possible to download these free files and install them on your server, so you can test how the site works.
Visit https://www6.waybackmachinedownloader.com/website-downloader-online/scrape-all-files/ to buy a fully functioning site.
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