Yes. Without a 777 account, you will not be able to play games.
When you create an account on 777.nl, you can play with real money, just like in a real arcade or casino. You can then deposit money into your account through various secure online payment methods, and withdraw any winnings to your bank account. To create an account and register on 777.nl, you need to click the 'Register now' link and fill out the form. Remember that you must be 18 years or older to create an account on 777.nl.