Halloween season is a seasonal event in Cookie Clicker. It begins on the 24th of October and ends on the 31st. Alternatively, it can also be activated at any time by purchasing the "Ghostly biscuit" upgrade, which is obtained by unlocking the season switcher, a heavenly upgrade that costs 1,111 heavenly chips.
The Halloween season features seven Halloween-themed flavored cookies and changes the appearance of wrath cookies to look like frowning jack-o-lanterns. The Halloween cookies can only be obtained by popping wrinklers, meaning you must first purchase the One Mind upgrade to obtain them.
List of the 7 known flavored cookies which may drop from Wrinklers during the Halloween season. Each flavored cookie has a base cost of 444,444,444,444 (444.444 billion) cookies.
|Icon||Name||Unlock condition||Base price||Description||ID|
|Skull cookies||Minimum 5% drop chance from popping a Wrinkler during Halloween Season||Cookie production multiplier +2%.
"Wanna know something spooky? You've got one of these inside your head RIGHT NOW."
|Ghost cookies||Cookie production multiplier +2%.
"They're something strange, but they look pretty good!"
|Bat cookies||Cookie production multiplier +2%.
"The cookies this town deserves."
|Slime cookies||Cookie production multiplier +2%.
"The incredible melting cookies!"
|Pumpkin cookies||Cookie production multiplier +2%.
"Not even pumpkin-flavored. Tastes like glazing. Yeugh."
|Eyeball cookies||Cookie production multiplier +2%.
"When you stare into the cookie, the cookie stares back at you."
|Spider cookies||Cookie production multiplier +2%.
"You found the recipe on the web. They do whatever a cookie can."
The current drop chance is 1-f, where f is the fail rate. The base fail rate is 0.95, or 0.8 if the achievement Spooky cookies is unlocked. There are several modifiers which can further reduce the fail rate.
|Green yeast digestives||1/1.03=0.970874|
|Santa's Bottomless Bag||1/1.1 = 0.9091|
|Selebrak, Spirit of Festivities||0.9/0.95/0.97 (Diamond/Ruby/Jade)|
|Mind Over Matter, Reality Bending, Both||0.8, 1/1.025 = 0.9756, 1/1.275 = 0.7843|
|Cosmic Beginner's Luck||0.2|
|Garden plants (mature, dirt)||1/(1+0.01G+0.01S+0.03K)|
G = # of Green Rot
S = # of Shimmerlily
K = # of Keenmoss
If you popped a shiny wrinkler with Mind Over Matter, Selebrak in Diamond slot and four Keenmoss in the garden, the fail rate will be:
Cookie Spawn Probabilities
Exploding a Wrinkler after it has begun to feed on the big cookie has a 5% chance of unlocking 1 of the 7 Halloween-themed cookie upgrades. If you have the Spooky cookies achievement, it increases to 20% chance. However, if the particular upgrade chosen at random is already unlocked, it will not unlock a new one. So on each Wrinkler explosion, the actual chance of unlocking a new cookie type is equal to:
Where N is the number of upgrades already unlocked and s=1-f is the success rate (0.05 normally, 0.2 with "Spooky cookies", 0.136364 with "Santa's bottomless bag", and 0.272727 with both). The table below shows how the success rate (r) effects the expected value of Wrinkler explosions needed to unlock all 7 Halloween cookie upgrades.
For example, with bare success rate (s=0.05), the expectation value is:
However, with "Santa's bottomless bag" and "Spooky cookies", s becomes 0.272727 and the expectation value drastically reduces to:
|Probability of Appearance|
& bag (s=0.2727)
|Expected value for Wrinkler explosions to unlock all||363/20s||363||90||133||67|
A method to get all the cookie upgrades quickly is to wait for a few wrinklers to spawn, wait for an autosave ("Game Saved" popup), pop the wrinklers quickly, and - if no cookie upgrade appeared - quickly hit F5 to reload before the game is autosaved again - the wrinklers will be back and you can try popping them again.
Another way, similar to the first, is to open multiple tabs with wrinklers, and pop the wrinklers on each tab until you get a cookie upgrade. Always leave one tab open with wrinklers, so if all the other tabs fail to give you a cookie upgrade, you can manually save on the tab that still has the wrinklers, and repeat the process.
|Spooky cookies [note 1]||Unlock every Halloween-themed cookie.
Owning this achievement makes Halloween-themed cookies drop more frequently in future playthroughs.
- The Halloween Season was first confirmed on Orteil's tumblr.
- The Halloween Season was added in version 1.039.
- The Halloween Season at first did not account for leap years, so the event would start and end one day earlier on leap years. However, this was eventually fixed in version 2.031.
- The Ghost cookies' text references the Ghostbusters theme song.
- The Slime cookies' text references the movie The Incredible Melting Man.
- The Bat cookies' text references the movie Dark Knight.
- The Eyeball cookies' text references a Friedrich Nietzsche quote.
- The Spider cookies' text references the Spider-Man cartoon theme song, as well as containing a joke about the internet.
- The price of the cookies being four sets of fours because in some Asian languages (e.g., Mandarin, Chinese, Japanese) the number 4 sounds like the word for death.
|Cookie Clicker game mechanics|
|Cookies||Cookie Clicker • Clicking • Buildings|
|General||Achievements • CpS • Milk • Golden Cookies • News Ticker • Options • Cheating • Sugar Lump|
Multipliers: Flavored Cookies • Kittens
Research: Grandmapocalypse • Wrath Cookies • Wrinklers • Shiny wrinklers
|Ascension||Ascension • Heavenly Chips • Challenge Mode|
Valentine's Day • Business Day • Easter • Halloween • Christmas
Garden • Stock Market • Pantheon • Grimoire