Try the game for free, no registration needed. However if you planning to unlock new weapons and compete in Top 100 list registration is required.
Players are ranked by total XP gained during gameplay. This list shows 100 players with highest score.
If you didn't received verification email after registration, go to Log-In page and try to login with registered info, it will give you an option to resend verification email. Also make sure to check Spam folder before requesting new verification email.