Servers

The  were a software that allowed users to play the game. Once they logged in, players had to choose a certain server to join. They could then interact with any other user on that server.

Safe Chat
Unlike the normal servers where players could chat freely, the Safe Chat servers featured a limited amount of words and phrases that players were able to say in-game. This ruled out the chance of players seeing swearing or inappropriate content, making the servers ideal for younger or sensitive users.

The first Safe Chat servers were introduced in April 2019.

Mature Chat
The mature chat allowed players to swear/cuss without breaking rules or being banned, but it still advised them to follow the mature rules. It was that only players above the age of 18 should be using the mature chat feature.

In April 2019, the Mature servers were first implemented for a one week trial for each language, but were later removed. It later made a comeback in October 2019 for another one week trial with just the English server Walrus. On October 25, 2019 it was announced that the Mature Servers would be a permanent addition to the game.

The mature servers were only accessible from the New Client and could not be accessed via the Old Client.

Staff Testing Server
This was a private server that could only be accessed by the Staff of Club Penguin Online. It was used by designers and developers to test parties, items and many other features in Club Penguin Online.

Clients
A feature unique to Club Penguin Online was the ability to play either the Old Client or New Client. The old client featured the old designs of Club Penguin, while the new client featured the newer design and game features. The servers enabled users from both old and new client to communicate and interact with each other as long as they joined the same server.

Trivia

 * Each server had a maximum capacity of 600 players.