Netpigs is free, anyone can access it via a standard web browser and play anytime 7 days 7, 24 hours a day.
The only requirement is the respect of rules of the game.
You can choose when and how Netpigs can contact you in order to alert you for the various events of the game.
Sometimes it may be sent emails in order to update users about important news and events that affect the game.
Each of these updates can be enabled or disabled from the Preferences page.
I took advantage of some free resources available on the web: