Registering is fast and free, but what's the point of doing it?
When you are a registered member, you get an account where you can store all the points you win when playing Uno®.
The more points you won, the more chances to appear on the the front page (in the ladderboard) you get.
Moreover, it allows you to save your records, your statistics and your preferences.
Concerning your e-mail address...
Your e-mail address will never be used in a suspicious maner.
I mean that it will never get out of this website and will never be sold to a commercial entity or whatever.
Your address will only be used if you lose your password and for sending a confirmation message after your registration.
It will never appear anywhere on this website.