99Rooms was an unique internet art project that mixes wall painting, photography, animation and sound. After its launch in June 2004, more than 50 million individuals throughout the world had visited this interdisciplinary composite work of art.
The classic flash version sadly not work on mobile devices & modern browsers anymore.
You can still play 99Rooms by download and install the Adobe Flash Player Debugger. Running the Adobe Flash Player Debugger, "open location" and paste this path "https://99rooms.com/index.swf"
See Youtube for a walkthrough.