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[[caption-width-right:315:Waddle around and meet new friends!]]
This little browser game, now owned by Disney, centers on users' personal penguin avatars, and their little lives. The game is somewhere in between a social network and a life simulation. You can chat with other people, buy and care for a pet, buy clothes, buy and furnish your igloo, and even change the color of your little penguin avatar. All of this is paid for by little minigames you can play in the little world. Some games are competitions with other penguins, while some are solo games. However, most of the interesting things you can buy, you can get only if you pay for your account.

The game itself doesn't provide much in terms of story. The closest thing to a plot the game provides comes in the form of the Penguin Security Agency's missions, in which the player has to protect the island from any threats. Most of these threats come from Herbert P. Bear, a polar bear who floated to the island via iceberg and is now trying to wreak havoc on the islanders, and Klutzy, his pet crab. After the eleventh mission, the PSA was disbanded and turned into the Elite Penguin Force.

In 2014, a Christmas special called ''We Wish You a Merry Walrus'' was broadcast for the first time. It stars a group of penguins working together to save Christmas and stop Herbert's latest EvilPlan.

!!This game provides examples of:

* AchievementSystem: Stamps. If you have a membership, you can even show them off by decorating your stamp book cover with them.
* AcidTripDimension: The Box Dimension. There are boxes everywhere, physics rarely works, and everything is floating in a purple swirly flow.
* {{Adorkable}}: Gary and Rookie are quite often seen as this by the fans.
* AllCheeringAllTheTime: ''Club Penguin'' used to have a play called "Team Blue's Rally 2", in which one of the characters was a cheerleader named Bella, who put everything that happened during the play in her cheers, and all she ever did was cheer.
* AllegedlyFreeGame: Here's some stuff that only members can do.
** Buy clothes.
** Go to member-only rooms. (Not that there are many of them by default, though.)
** [[AnInteriorDesignerIsYou Decorate and upgrade your igloo.]]
** Continue to the next level on games such as Jet Pack Adventure.
*** It wasn't always this way. All players used to be able to play every game fully until some time since Disney bought CP.
** Own puffles colored differently from red and blue.
** And now, '''transform into magical things like ghosts, reindeer puffles and Jack Frost, dinosaurs, and as of February 2013, movie stars.'''
*** Luckily, it seems as though they're being kinder to non-members, by actually allowing them to buy certain clothing from the Clothing Catalog and giving them some furniture for their igloos.
** Get clothing for your puffle and get upgrades in the mini-games like Hydro Hopper and Jetpack Joyride. At least this is getting better, with clothing items and furniture, but the parties have considerably less things for non-members to do. Oh, well. It's a start. Coincidentally, things started to get better as soon as Billybob retired and Spike Hike moved in.
* AnIcePerson: The Puffle Handbook describes White Puffles having the ability to "freeze liquids at will".
* ArtEvolution: The game's art style has definitely changed a lot throughout the years, which gets pretty funny when the newer clothing and items don't jell very well with the old ones, comparing the early items to the later ones is like night and day!
** Want examples? [[http://clubpenguinwiki.info/wiki/Penguin_Style#Gallery Just take a look at the catalogs throughout the years]]. Scroll down to the gallery section. Try comparing the first one to the last one.
** Also, check out how much the [[http://clubpenguinwiki.info/wiki/Map#Gallery map]] has changed from the beta ages in 2005 to today. Again, scroll down to the gallery.
* AscendedMeme: There was once a rumor where if you stand in the Dojo for 30 minutes, you will become a ninja. Now, we have Card-Jitsu.
* BearsAreBadNews: Herbert P. Bear.
* BigBad:
** Herbert P. Bear in PSA and EPF Missions.
** Protobot, which Herbert rebuilt.
* BigNo: Herbert when you beat operation blackout.
* BreadEggsMilkSquick: The server names. Rainbow, Hot Chocolate, Beanbag... ''Hypothermia?''
* ClamTrap: In the game "Aqua Grabber", a giant clam will close down on the player if they take its pearl, causing them to lose air, unless they pull a WeightAndSwitch with a pearl-shaped rock.
* CollectionSidequest: Stamps, Pins and Free Items.
* DarkerAndEdgier: You'll notice it when you look at Operation: Blackout. Herbert kidnaps Gary (and plans on kidnapping the other EPF agents as well), takes him to his lair, and [[HumanPopsicle freezes him alive]]. Then, he builds a ray that can control the sun, which he uses to focus the sun on his lair alone, darkening and pretty much freezing the rest of the island. He declares himself the island's ruler, and demands the island's inhabitants obey him. Anyone who disobeys him gets the same punishment that Gary got. Also, as the days continued on suing the event, the ice caused by the blocked-out sun built up more and more, until by the last few days, the map was COVERED in ice.
* DevelopmentGag: In one of the PSA missions, a penguin calls the Hydro Hopper "you old biscuit", a reference to the game's original name, "Ballistic Biscuit"
* TheDitz: Rookie.
** GeniusDitz: He can speak CRAB. Using nothing but a TYPEWRITER.
* TheDragon: Protobot was for Herbert. [[spoiler: Until Herbert double-crossed him.]]
* ElementalRockPaperScissors: Card-Jitsu is basically this: Water extinguishes fire, fire burns snow/ice, snow/ice freezes water.
* EverythingsBetterWithPenguins: Take a wild guess what everyone plays as.
* ExtremeOmnivore: Orange puffles eat everything, including boxes and food bowls.
* FiveManBand:
** TheHero: You.
** TheLancer: Jet Pack Guy.
** TheSmartGuy: Gary the Gadget Guy.
** TheChick: Dot the Disguise Gal.
** TheBigGuy: Rookie, though more out of idiocy than strength. Usually he's just TheLoad though. And TheDitz.
* GadgeteerGenius: Brown puffles. Also, if the name is of any indication, Gary the Gadget Guy, who made most of the field agents' equipments.
* GameWithinAGame: The mini-games. You earn coins from them, too.
* GassHole: A penguin can fart by pressing "et" outside the chatbox.
* IdiotBall: When Rookie is tricked into [[spoiler:letting Herbert go free in Mission 10 ''by lending him his Spy Phone.'']]
* LampshadeHanging: A screen in the EPF headquarters can be tuned in on two penguins having a conversation. Cue a caption on the bottom of the screen...
--> This conversation would probably be a lot more interesting in sound... huh?
* MassivelyMultiplayerOnlineRolePlayingGame
* MoeAnthropomorphism: Used a lot in fan-art and fan fiction.
* OnlyKnownByTheirNickname: Jet Pack Guy. Even Gary doesn't know what his name is.
** We eventually find out that his real name is [[spoiler:Guy]].
* OldMaster: Sensei, who taught players the art of Card-Jitsu.
* PerpetualFrowner: Black puffles.
** Jet Pack Guy could also count. Most of the time, anyway.
* PlayingWithFire: Black puffles will catch fire when given O-berries.
* TheProfessor: Gary the Gadget Guy.
* QuirkyMinibossSquad: Herbert and Klutzy. Though considering Club Penguin a children's game to begin with, this is expected.
* RedOniBlueOni: Red Team Vs. Blue Team and the [[spoiler:Dodgeball]] play at the stage. Nowadays, the Blue team seems to be the most popular. Seriously, Team Red, Green and Yellow needs some love too! It's impossible to have a real match on the Ice Rink/Stadium nowadays. Why? [[FanDumb Practically everyone's on Team Blue]] and acts like sassy high school cheerleaders and/or football/soccer jocks for some reason.
* TheReveal: [[spoiler: Aunt Arctic is the director.]]
* RidiculouslyCuteCritter: Puffles.
* SailorEarth: You wouldn't believe how many fanfictions there are about penguins who join the PSA/EPF. Most of which end up going through the exact same story.
** Also, most of these tend to be females that fall in love with [[FoeYay Herbert.]]
* SecretIdentity: The Director.
* ShrinkingViolet: Gary switches back and forth on this. On one hand, he's perfectly fine with just about everyone in missions and okay with getting interviewed. But if a decently sized crowd of people gather around him outside of missions, he'll run into another room or hide behind things.
* SlippySlideyIceWorld: Club Penguin itself. When the Ice Rink is up, this trope is played relatively straight, as you sliiiide from point A to point B.
* {{Snowlems}}: The basic Mooks you'll face in Card-Jitsu Snow.
* TerribleTrio: The Test Bots.
* UnreliableNarrator: Herbert.
* VirtualPaperDoll: Pretty much the basis of the game. That, and "Waddle Around and Meet New Friends!". (Which was their slogan, just in case you didn't know.)
* WarmHeartedWalrus: In ''We Wish You A Merry Walrus'', the Merry Walrus is kind and generous, and is essentially the FunnyAnimal version of SantaClaus.
* WhamLine: [[spoiler: "Now you know the truth."]]
* WilyWalrus: Tusk is a massive walrus with [[AnIcePerson ice powers]] who created an army of snowmen to destroy Sensei and the other penguins.