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Easter is a seasonal event in Cookie Clicker. It was added on May 18, 2014, with the 1.0464 update. Since the 1.0466 update, Easter starts automatically and lasts from 7 days before Easter (Palm Sunday) to Easter itself (Resurrection Sunday)(The Saturday before Palm Sunday to Easter itself on a leap year).

After purchasing the heavenly upgrade Season Switcher, Easter can also be activated for 24 hours by purchasing Bunny biscuit. The upgrade is repeatable, but it gets more expensive each time it is bought, similar to buildings.

Here is a list of the 20 Upgrades that are from the Easter Season. All upgrades are egg/larvae based in theme and can be unlocked randomly when clicking a Golden Cookie, Wrath Cookie, or popping a wrinkler. The price of purchasing each egg goes up based on the number of eggs purchased so far (E in the chart below).

Icon Name Unlock condition Base price Description ID
Chicken egg "Common" eggs (see Probabilities). 999 x 2E Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"The egg. The egg came first. Get over it."
210
Duck egg Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"Then he waddled away."
211
Turkey egg Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"These hatch into strange, hand-shaped creatures."
212
Quail egg Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"These eggs are positively tiny. I mean look at them. How does this happen? Whose idea was that?"
213
Robin egg Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"Holy azure-hued shelled embryos!"
214
Ostrich egg Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"One of the largest eggs in the world. More like ostrouch, am I right?
Guys?"
215
Cassowary egg Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"The cassowary is taller than you, possesses murderous claws and can easily outrun you.
You'd do well to be casso-wary of them."
216
Salmon roe Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"Do the impossible, see the invisible.
Roe roe, fight the power?"
217
Frogspawn Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"I was going to make a pun about how these "toadally look like eyeballs", but froget it."
218
Shark egg Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"HELLO IS THIS FOOD?
LET ME TELL YOU ABOUT FOOD.
WHY DO I KEEP EATING MY FRIENDS"
219
Turtle egg Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"Turtles, right? Hatch from shells. Grow into shells. What's up with that?
Now for my skit about airplane food."
220
Ant larva Cookie production multiplier +1%.
Cost scales with how many eggs you own.
"These are a delicacy in some countries, I swear. You will let these invade your digestive tract, and you will derive great pleasure from it.
And all will be well"
221
Golden goose egg "Rare" eggs (see Probabilities). 999 x 3E Golden cookies appear 5% more often.
Cost scales with how many eggs you own.
"The sole vestige of a tragic tale involving misguided investments."
222
Faberge egg All buildings and upgrades are 1% cheaper. [note 1]
Cost scales with how many eggs you own.
"This outrageous egg is definitely fab."
223
Wrinklerspawn Wrinklers explode into 5% more cookies.
Cost scales with how many eggs you own.
"Look at this little guy! It's going to be a big boy someday! Yes it is!"
224
Cookie egg Clicking is 10% more powerful.
Cost scales with how many eggs you own.
"The shell appears to be chipped.
I wonder what's inside this one!"
225
Omelette Other eggs appear 10% more frequently.
Cost scales with how many eggs you own.
"Fromage not included."
226
Chocolate egg Contains a lot of cookies.
Cost scales with how many eggs you own.
"Laid by the elusive cocoa bird. There's a surprise inside!"
227
Century egg You continually gain more CpS the longer you've played in the current session.
Cost scales with how many eggs you own.
"Actually not centuries-old. This one isn't a day over 86!"
228
"egg" +9 CpS
"hey, it's "egg""
229
1. Upgrades which lower the cost of upgrades stack multiplicatively, not additively. That is, if you have 3 of them which reduce the cost of upgrades by 5%, 2% and 1% then the final cost of an upgrade is (original cost) * 0.95 * 0.98 * 0.99.

## Unlocking EggsEdit

Eggs are unlocked randomly during the Easter season by either popping wrinklers or clicking Golden/Wrath Cookies. The base fail rate to unlock an egg from a Golden/Wrath Cookie is 90% (0.9), while the base fail rate for a wrinkler is 98% (0.98). There are many modifiers that can reduce the fail rate.

Modifier Factor
Green yeast digestives 1/1.03=0.970874
Santa's Bottomless Bag 1/1.1=0.909091
Hide & seek champion 0.7
Omelette 0.9
Starspawn 0.9
Selebrak, Spirit of Festivities 0.9/0.95/0.97 (Diamond/Ruby/Jade)
Mind Over Matter, Reality Bending, both 1/(1.25, 1.025, 1.275)=0.8, 0.98, 0.78
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

For example, if you click a Golden cookie and you have Omelette, Starspawn, Santa's Bottomless Bag and Mind Over Matter, the fail rate is

$f=0.9*0.9*0.8*(1/1.1)\approx 0.589091$

You can also easily cheat when farming eggs drops (and other rare wrinkler's drops). If you pop a wrinkler and reload the page without saving, the wrinkler will come back. Therefore, you can save the game, pop your wrinklers, and if they drop nothing, reload the page. Then simply repeat until they drop something.

### Egg Unlock ProbabilitiesEdit

When an egg is generated, there is a 10% chance for it to be a rare egg, otherwise it is a common egg.

If the generated egg has already been unlocked, then a second egg is generated. This reduces, but does not nullify, the effect the number of already unlocked eggs has on your chances of finding new eggs. Having more eggs reduces the chance of you finding other eggs quadratically.

The probabilities of generating a new egg, a common egg, any rare egg, or a specific rare egg (e.g. omelette) can be calculated using the following formulas, where n is the number of normal eggs already unlocked, and r is the number of rare eggs already unlocked:

• Pr(new egg)$=1-(\frac{6n+r}{80})^2=1-\frac{9n^2}{1600}-\frac{3nr}{1600}-\frac{r^2}{6400}$
$=1 -0.005625 n^2-0.001875 n r-0.00015625 r^2$
 Number of rare eggs already unlocked 0 1 2 3 4 5 6 7 8 Number of normal eggs already unlocked 0 1. 0.999844 0.999375 0.998594 0.9975 0.996094 0.994375 0.992344 0.99 1 0.994375 0.992344 0.99 0.987344 0.984375 0.981094 0.9775 0.973594 0.969375 2 0.9775 0.973594 0.969375 0.964844 0.96 0.954844 0.949375 0.943594 0.9375 3 0.949375 0.943594 0.9375 0.931094 0.924375 0.917344 0.91 0.902344 0.894375 4 0.91 0.902344 0.894375 0.886094 0.8775 0.868594 0.859375 0.849844 0.84 5 0.859375 0.849844 0.84 0.829844 0.819375 0.808594 0.7975 0.786094 0.774375 6 0.7975 0.786094 0.774375 0.762344 0.75 0.737344 0.724375 0.711094 0.6975 7 0.724375 0.711094 0.6975 0.683594 0.669375 0.654844 0.64 0.624844 0.609375 8 0.64 0.624844 0.609375 0.593594 0.5775 0.561094 0.544375 0.527344 0.51 9 0.544375 0.527344 0.51 0.492344 0.474375 0.456094 0.4375 0.418594 0.399375 10 0.4375 0.418594 0.399375 0.379844 0.36 0.339844 0.319375 0.298594 0.2775 11 0.319375 0.298594 0.2775 0.256094 0.234375 0.212344 0.19 0.167344 0.144375 12 0.19 0.167344 0.144375 0.121094 0.0975 0.0735938 0.049375 0.0248438 0
• Pr(common)$=\frac{72-6n}{80}(1+\frac{6n+r}{80})=\frac{9}{10}-\frac{3n}{400}-\frac{9n^2}{1600}+\frac{9r}{800}-\frac{3nr}{3200}$
$=0.9 -0.0075 n-0.005625 n^2+0.01125 r-0.0009375 n r$
 Number of rare eggs already unlocked 0 1 2 3 4 5 6 7 8 Number of normal eggs already unlocked 0 0.9 0.91125 0.9225 0.93375 0.945 0.95625 0.9675 0.97875 0.99 1 0.886875 0.897187 0.9075 0.917812 0.928125 0.938437 0.94875 0.959062 0.969375 2 0.8625 0.871875 0.88125 0.890625 0.9 0.909375 0.91875 0.928125 0.9375 3 0.826875 0.835313 0.84375 0.852188 0.860625 0.869063 0.8775 0.885938 0.894375 4 0.78 0.7875 0.795 0.8025 0.81 0.8175 0.825 0.8325 0.84 5 0.721875 0.728438 0.735 0.741563 0.748125 0.754688 0.76125 0.767813 0.774375 6 0.6525 0.658125 0.66375 0.669375 0.675 0.680625 0.68625 0.691875 0.6975 7 0.571875 0.576563 0.58125 0.585938 0.590625 0.595313 0.6 0.604688 0.609375 8 0.48 0.48375 0.4875 0.49125 0.495 0.49875 0.5025 0.50625 0.51 9 0.376875 0.379688 0.3825 0.385313 0.388125 0.390938 0.39375 0.396563 0.399375 10 0.2625 0.264375 0.26625 0.268125 0.27 0.271875 0.27375 0.275625 0.2775 11 0.136875 0.137812 0.13875 0.139688 0.140625 0.141562 0.1425 0.143438 0.144375
• Pr(any rare)$=\frac{8-r}{80}(1+\frac{6n+r}{80})=\frac{1}{10}+\frac{3n}{400}-\frac{9r}{800}-\frac{3nr}{3200}-\frac{r^2}{6400}$
$=0.1 +0.0075 n-0.01125 r-0.0009375 n r-0.00015625 r^2$
 Number of rare eggs already unlocked 0 1 2 3 4 5 6 7 Number of normal eggs already unlocked 0 0.1 0.0885938 0.076875 0.0648438 0.0525 0.0398438 0.026875 0.0135938 1 0.1075 0.0951563 0.0825 0.0695313 0.05625 0.0426563 0.02875 0.0145313 2 0.115 0.101719 0.088125 0.0742188 0.06 0.0454688 0.030625 0.0154688 3 0.1225 0.108281 0.09375 0.0789063 0.06375 0.0482813 0.0325 0.0164063 4 0.13 0.114844 0.099375 0.0835938 0.0675 0.0510938 0.034375 0.0173438 5 0.1375 0.121406 0.105 0.0882813 0.07125 0.0539063 0.03625 0.0182813 6 0.145 0.127969 0.110625 0.0929688 0.075 0.0567188 0.038125 0.0192188 7 0.1525 0.134531 0.11625 0.0976563 0.07875 0.0595313 0.04 0.0201563 8 0.16 0.141094 0.121875 0.102344 0.0825 0.0623438 0.041875 0.0210938 9 0.1675 0.147656 0.1275 0.107031 0.08625 0.0651563 0.04375 0.0220313 10 0.175 0.154219 0.133125 0.111719 0.09 0.0679688 0.045625 0.0229688 11 0.1825 0.160781 0.13875 0.116406 0.09375 0.0707813 0.0475 0.0239063 12 0.19 0.167344 0.144375 0.121094 0.0975 0.0735938 0.049375 0.0248438
• Pr(given rare)$=\frac{1}{80}(1+\frac{6n+r}{80})=0.0125 +0.0009375 n+0.00015625 r$
 Number of rare eggs already unlocked 0 1 2 3 4 5 6 7 Number of normal eggs already unlocked 0 0.0125 0.0126563 0.0128125 0.0129688 0.013125 0.0132813 0.0134375 0.0135938 1 0.0134375 0.0135938 0.01375 0.0139063 0.0140625 0.0142188 0.014375 0.0145313 2 0.014375 0.0145313 0.0146875 0.0148438 0.015 0.0151563 0.0153125 0.0154688 3 0.0153125 0.0154688 0.015625 0.0157813 0.0159375 0.0160938 0.01625 0.0164063 4 0.01625 0.0164063 0.0165625 0.0167188 0.016875 0.0170313 0.0171875 0.0173438 5 0.0171875 0.0173438 0.0175 0.0176563 0.0178125 0.0179688 0.018125 0.0182813 6 0.018125 0.0182813 0.0184375 0.0185938 0.01875 0.0189063 0.0190625 0.0192188 7 0.0190625 0.0192188 0.019375 0.0195313 0.0196875 0.0198438 0.02 0.0201563 8 0.02 0.0201563 0.0203125 0.0204688 0.020625 0.0207813 0.0209375 0.0210938 9 0.0209375 0.0210938 0.02125 0.0214063 0.0215625 0.0217188 0.021875 0.0220313 10 0.021875 0.0220313 0.0221875 0.0223438 0.0225 0.0226563 0.0228125 0.0229688 11 0.0228125 0.0229688 0.023125 0.0232813 0.0234375 0.0235938 0.02375 0.0239063 12 0.02375 0.0239063 0.0240625 0.0242188 0.024375 0.0245313 0.0246875 0.0248438

### Average Unlock TimeEdit

If we unlock easter eggs using only Golden Cookies, the average number of Golden Cookie clicks required to unlock all easter eggs can be calculated. The calculation includes the effects of unlocking the Omelette egg (whenever it spawns naturally). Therefore, please ignore omelette factor when calculate the fail rate in this section.

The result curve is very similar to Log-normal distribution. For each fail rate we may fit the probability curve to Log-normal distribution to find the parameter μ and σ. Then we can use the formula on Wikipedia to obtain the probability we want.

For example, at fail rate 0.9, if you clicked or popped 753 objects, then there is 50% chance to collect all Easter eggs.

Number of object needed to unlock all Easter Eggs
fail rate 50% 75%  95% 98% Log-normal distribution
μ σ
0.98 2351 3524 6310 8066 7.7625 0.6003
0.97 1755 2515 4218 5245 7.4704 0.5330
0.96 1437 2005 3241 3967 7.2700 0.4946
0.95 1231 1691 2670 3236 7.1157 0.4706
0.94 1085 1474 2291 2759 6.9890 0.4546
0.93 973 1313 2019 2420 6.8808 0.4435
0.92 885 1188 1812 2166 6.7858 0.4356
0.91 813 1087 1649 1966 6.7009 0.4298
0.9 753 1003 1516 1804 6.6240 0.4254
0.875 637 845 1269 1506 6.4575 0.4185
0.85 554 733 1096 1299 6.3176 0.4148
0.825 491 649 968 1146 6.1965 0.4128
0.8 441 582 868 1027 6.0895 0.4116
0.75 367 485 722 854 5.9062 0.4108
0.7 315 416 619 732 5.7526 0.4106
0.6 246 324 483 571 5.5034 0.4110
0.5 201 266 396 469 5.3050 0.4113
0.3 148 196 291 345 4.9982 0.4112

## Cookie Production Global MultiplierEdit

The cookie production global multiplier that many of the eggs modify is essentially another form of cookie multiplier.

The final CpS formula is essentially: CpS * Cookie Multiplier (cookie types, Heavenly Chips, frenzy/elder frenzy bonus/clot penalties, etc.) * Global Multiplier

For example, if you have some cookie types and kitten bonuses totaling a 1000% cookie multiplier, and a base CpS of 10,000, giving you a total income of 100,000 cookies per second, and you bought two common eggs, your new total CpS would be 102,010 (10,000 * 10 * 1.012). If you then unlocked another kitten upgrade increasing your base cookie multiplier to 1500%, your income would increase to 153,015 (10,000 * 15 * 1.012)

## AchievementsEdit

Icon Name Description ID
The hunt is on Unlock 1 egg. 166
Egging on Unlock 7 eggs. 167
Mass Easteria Unlock 14 eggs. 168
Hide & seek champion Unlock all the eggs.
Owning this achievement makes eggs drop more frequently in future playthroughs.
169

Note: The eggs only need to be 'found' for the achievements to be earned, they do not need to be purchased. While this may not matter since most eggs will end up being purchased, it is handy to know that you can get the achievements while saving the Chocolate Egg for later to get a larger sum of cookies from its one-time effect.

## TriviaEdit

• The description of the upgrade "Duck Egg" is a reference to a popular YouTube video, "The Duck Song."
• The omelette's flavor text is a reference to the "omelette du fromage" episode of Dexter's Laboratory.
• The salmon roe flavor text is a reference to a song in the anime Tengen Toppa Gurren Lagann.
• The Century egg is an ingredient in Chinese cuisine, while the flavour text is a reference to the Discworld novel Interesting Times.
• The Shark egg's description is from the thoughts of sharks in one of Orteil's other games, Nested. It is possibly also a reference to the sharks from the Pixar film "Finding Nemo".
• The Bunny Grandma bears a striking resemblance to Frank, a character from the 2001 film 'Donnie Darko'.
• The robin egg's flavor text is a reference to the catchphrase of Robin from the 1960s Batman TV Series.
• The Golden Goose Egg's flavor text is a reference to Jack and the Beanstalk, as well as a related idiom: "killing the goose that laid the golden eggs."
• The Bunny biscuit text is a reference to one of the rabbit myths told in Watership down.
• The "egg" bears a strong resemblance to Yoshi's eggs from Super Mario World and a normal Pokémon egg from the game series "Pokémon". It may also be a reference to the glitch pokemon "Egg". This pattern is also similar to a default spawn egg from Minecraft.
• Orteil said that the flavor text for "egg" is neither a pun nor a reference. However, in French, "an egg" is pronounced "un œuf" which sounds exactly like "neuf" = 9.
• Mass Easteria is probably a reference to mass hysteria, also called mass psychogenic illness.
• Golden/Wrath cookies from a Cookie Storm or Cookie Chain still can unlock eggs.
Cookie Clicker game mechanics