The DEMO version only includes 4 pages:
http://juegodemariobros.org
http://juegodemariobros.org/todos-los-juegos.html
http://juegodemariobros.org/mario/supermariocapavoladora.html
http://juegodemariobros.org/mario/minimario.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://www.waybackmachinedownloader.com/en/buy-wayback-machine-downloader-recover/ to buy a fully functioning site.
Go back to the index page