I save player game states to my server. I track ads served as well as the number of unique players who visit the site.
I share unique daily visitor counts & numbers of advertisements displayed publicly for the purpose of selling ad space to pay for my time, the monthly cost of a dedicated server and to pay for contractors who create graphics and sounds for new and existing games.
For reasons of site performance the ads on this site are served directly from my server. I would encourage people who enjoy my games to click on ads that interest them.
Clicking on an ad does not cause a game in progress to be lost, the ad will simply be opened in a new tab.