Halloween is an autumn event that is celebrated by the villagers of the town in the Animal Crossing series. Jack, a character wearing a pumpkin on his head, appears at 6:00 PM until 1:00 AM. During this time, villagers around the town will dress up like him. The event happens in every game, excluding Animal Crossing: Wild World.
Throughout October, candy is stocked and sold in Tom Nook's Store taking the place of either tools or flowers. There are four types of candy, but Tom Nook's candy appears orange making it hard to distinguish what color candy he is selling, out of green, red, yellow and blue. When Jack appears in the town, villagers and Mayor Tortimer will be dressed like him. The villagers will attempt to chase the player in order to get some candy. If the player doesn't own any candy, or chooses not to hand candy over to them, one item in inventory or the player's clothes will be transformed. Jack can be spoken to in order to receive an item from the Spooky Series. Once the player receives an item, they can leave the square and find Jack again in another random location. When you talk to Jack and if you don't have candy he may turn one or more items in your inventory into a Jack-in-a-Box or Jack-o'-Lantern.
Spooky music will play outside in the town, and there will be no rain or clouds throughout the night.
In Animal Crossing
In Animal Crossing, from 6:00 PM until 1:00 AM, the player can go around their town where the villagers are all outside. If the player is seen by the villagers, they will chase them. If the player is caught, they will demand Candy. If the player chooses to give Candy, the Candy will be eaten and the player receives nothing. If the player chooses to not hand over any Candy, they will be punished by having an item in their pockets or their shirt transformed. Items can be transformed into Jack-o'-Lanterns or Jack-in-the-Boxes. The shirt can be transformed into a Patched Shirt. The villagers are all dressed like Jack, the self-proclaimed King of Halloween, including Tortimer, in a dark blue cloak and a Jack O'Lantern mask. Jack and Tortimer are the only two that do not chase the player, which makes them easy to distinguish. Tortimer will give the player a Katrina's Tent Model. Jack can be spoken to as many times as the player desires, in order to receive furniture from the Spooky Series.
Write 10 letters to the Museum and fill them with Candy. This stops the animals from changing them into Jack-o'-Lanterns or Jack-in-the-Boxes. When you locate Jack, take a Candy out of an envelope and place it in inventory. Speak to Jack and give him the Candy. Immediately place the Spooky item in an envelope to keep it safe from villagers. Leave the square and find Jack again to try to get the full series. Each extra item sells to Tom Nook for 10,310 Bells which is quite a profit from the 100 Bells originally paid for the Candy.
In City Folk
Halloween was absent from Animal Crossing: Wild World, but returns in Animal Crossing: City Folk. Unlike the original, not all the villagers go out on Halloween night, and those who remain in their houses are able to be trick-or-treated upon. In order to do so, the player will need to wear a costume which is made up of a 'Look' - in GracieGrace, the witch's hat and cloak are sold through out September and October, which make up a 'look'. Costumes don't necessarily have to be spooky. If caught by villagers outside, they will ask for candy. If the player doesn't have any on them, they can use other items which will then be turned into Jack-in-the-boxes. Refusing to give anything results in the player's clothes, accessories and any other items the player has in their pockets being changed. Villagers will chase the player though, however, Jack won't, making him easy to distinguish.
In New Leaf
Similar to Animal Crossing: City Folk, only some villagers are out at any one time during Halloween, while the ones remaining in their homes have to be scared by wearing the mask of something they are afraid of, which are sold throughout October at the Able Sisters. Villagers who are outside chase the player upon noticing them and, when caught, the player is given the choice of either handing over candy or being tricked. If the candy option is chosen, the villager will receive one candy in exchange for hints at what other villagers are scared of; if the trick option is chosen, the player has to play a game of charades or rock-paper-scissors. Winning the game results in the villager handing over one candy, while losing a game results in a 'trick' where the player's empty inventory becomes filled with junk items, primarily Old Flooring or Old Wall. They may also swap your clothing with patched shirt, patched pants or patched shoes, and if you're not wearing a mask they will give you the pumpkin mask they're wearing. There are a total of four pumpkin masks. Successfully scaring the villagers inside their homes leads to them giving lollipops, instead of candy. The player then has to find Jack and give him the lollipops in exchange for Jack-exclusive Creepy Set furniture. Giving Jack candy will most often net the player pieces of the Spooky Series (which can also can be purchased from Nookling Stores), though there is a slight chance the player can also receive a piece of the Creepy Set.
Tips for Halloween
Do not let a villager chase you and go in a building, they will be waiting outside (except in New Leaf, where the villager will do the sighing emotion and stop chasing. Always wear a design or Gracie Grace clothing in Animal Crossing: City Folk and wear spare clothes in Animal Crossing. Always have candy in your pockets. In Animal Crossing: New Leaf, you can get candy without buying it prior to Halloween, but it will take significantly longer to finish the event.