Zuma blitz free online. (We very frequently hear things like, 'it would be way cooler if the Petpets were more interactive,' so we wanted to oblige.):) The Petpet Park world uses Neopian characters, settings, and history, so it's still part of the Neopets universe, but it's separate from the site itself.

Petpet Park Beta is now open for business! You can log in with your existing Neopets username and password and then you get to adopt a cute little Petpet of your choice. It looks like you will be able to have up to 4 different Petpets per account.
Once you have your Petpet companion, you will be able to enter the mini-environment and chat with other users! You can also start visiting various different places. To enter a building, click on the paw print in the red circle in front of the door. You can leave buildings by clicking the 'x' on the top right corner of your screen or by clicking another paw print circle.
It looks like you will be able to customize your Petpet with clothes, play lots of games, educate your Petpet, and make them do special tricks.
Keep in mind that this is a BETA, which means you are bound to run into some glitches and bugs as well as some areas that are currently under construction. Some people have reported that once you enter the spa, you are not able to leave.
Pages of interest:
About Petpet Park Petpet Park FAQ Petpet Park Beta
Many thanks to hoeiva on the forums for informing us!
Now Hiring! As Petpet Park is opening to beta soon, we are seeking some interested users who plan on participating in and playing Petpet Park. As a JN staffer, you will be responsible for maintaining a future section of JN that covers the many aspects of Petpet Park, along with coordinating with other JN departments such as the ItemDB and BoA to make sure that Petpet Park related items and characters are added to their respective areas. If you're interested, email a sample of some Neopets-themed writing that you have written to dave at jellyneo dot net and terry at jellyneo dot net. You should also include some information about yourself and why you would like to work at JN. We're looking forward to reading your applications. :)