Towards the end of the year, the plump and pleasant Yool schedules a relaxing sojourn on Cold Island. Its arrival is heralded by the jingle bells dangling from its antlers, and the booming resonance of its voice.  Just being near a Yool produces feelings of peace and joy, so the other monsters always try and convince him to stay the whole year round .

This monster, like all Seasonal monsters, cannot breed.


The Yool is a stout, bearded monster whose upper parts are covered in white fur.

Like many species of real life reindeers, Yools are antler-bearing, have hooves as feet, and brown hair covering their legs. Unlike a reindeer, however, the monsters are bipedal, have elf-like ears and candy-cane-patterned arms, with red and white stripes. The central part of the body of a Yool is green, and has snowflake-like patterns in it.

Furthermore, all Yools have sleigh bells on their antlers, that are used by the monsters to produce their songs.


Audio sample:
Memory Audio CR

The Yool sings "Ho Ho Ho Ho" in a resonating baritone voice, as Santa Claus is supposed to do, and also shakes its head quickly to jingle the bells on its antlers.


The Yool Monster can only be bred for a limited time during the Christmas season, and occasionally out of season (see the Notes section below for specific dates). There is one possible combination:

On September 12th, 2014 the breeding combination was changed. The old breeding combination for Yool (Deedge and Thumpies) was one of the combinations for Grumpyre; since they both had the same breeding time, you would not know which one you would get if the speed-up time was 36 hours. Presumably the breeding combination change was made to eliminate this potential confusion.

  • In 2013, the breeding began on December 10th and ended on January 6th, 2014.
  • For Vita players, breeding and purchase availability extends from December 1st to December 31st every year, based on the date set on the system.
  • In 2014, breeding began on December 3rd and ended on January 5th, 2015.
  • In 2015, breeding began on TBA data and ended on TBA date.
  • For 2016, breeding began on December 2nd and will end sometime in January.
  • In 2017, an out of season promotion began 6/16/17. Both Yool and Rare Yool were available.

NOTE: Yool can only be bred or purchased during the dates listed. Any Yools on Cold Island that are obtained during that time will stay unless they are sold.   

Earning Rate and Maximum Income

Earning rate is in coins per hour and depends on Happiness % (Likes increase Happiness), also each monster has a limit to how much income it can hold at a time. Increasing the monster's level increases the limit.

Level Per Minute Coins 2.0 Maximum Coins 2.0
0% Happiness 25% Happiness 50% Happiness 75% Happiness 100% Happiness
1 7 8 10 12 14 2,856
2 11 13 16 19 22 4,570
3 17 21 25 29 34 6,854
4 22 27 33 38 44 9,139
5 28 35 42 49 56 11,424
6 34 42 51 59 68 13,709
7 39 48 58 68 78 15,994
8 45 56 67 78 90 18,278
9 50 62 75 87 100 20,563
10 56 70 84 98 112 22,848
11 62 77 93 108 124 25,133
12 67 83 100 117 134 27,418
13 73 91 109 127 146 29,702
14 78 97 117 136 156 31,987
15 84 105 126 147 168 34,272

Feeding Monsters

Each monster needs to be fed four times before it reaches the next level. Increasing the monster's level increases the coins earned per minute, as well as the maximum coins earned.

Level Food Per Feeding Total Food Needed Per Level
1 10 x4 40
2 20 x4 80
3 40 x4 160
4 80 x4 320
5 160 x4 640
6 320 x4 1,280
7 640 x4 2,560
8 1,280 x4 5,120
9 2,560 x4 10,240
10 5,120 x4 20,480
11 10,240 x4 40,960
12 20,480 x4 81,920
13 40,960 x4 163,840
14 81,920 x4 327,680


  • ThumpiesGo to Thumpies
  • DeedgeGo to Deedge
  • Piney TreeGo to Piney Tree
  • Crumpler TreeGo to Crumpler Tree

Every monster has different things that they like. For every unique object that they like that's placed near the monster (if not using a Unity Tree), the monster's happiness will increase by 25%. Placing two of the same liked item near a monster will still only increase happiness by 25%. Below are the things liked by Yool:

See the Likes page to view a complete list of all monsters' likes.


Some items to take into consideration when designing your island by strategy are number of beds for the monster, rate of income per bed, max income per bed, and time for max income to be reached. The income below is for level 15:

Number of Beds 1
Rate of Income High 168
Rate of Income Low 84
Max Income 34,272
Rate of Income per Bed High 168
Rate of Income per Bed Low 84
Max Income per Bed 34,272
Time to Max Income @ High 3:24 hours
Time to Max Income @ Low 6:48 hours

Monster Translations

The Yool has a variety of translations in the game.

Language Name
English Yool
Espanol Yole
Français Caribou-bou
Deutsch Mittwint
Português Papai Yule
Italian Jol
Russian Йоле

Name Origin

The name "Yool" comes from the name of an ancient pagan mid-winter festival, Yule, which was later absorbed into Christmas. Yule is short for Yuletide.


  • The Yool monster was the second Seasonal monster to be introduced to the game and appeared in the Market on December 5, 2012. It was initially available for purchase or breeding until 12:00 am EDT, December 26, 2012, but was extended until January 2, 2013.
  • Unlike most monsters, Yool only likes two decorations, the Crumpler Tree and the Piney Tree.
  • The Yool made an unofficial appearance in the Market during the Easter 2013 celebration, where it was available for purchase but without confirmation of successful breeding attempts. Officially, the Yool returned out of season with fanfare from April 30 until May 7, 2013 at noon ET. Confirmed to be available by breeding or purchase with diamonds (at an inflated price of 225).
  • The Punkleton, Yool, and the Hoola are the only seasonal monsters that still cost 150Diamond25px during the regular availability time.
  • Being a Christmas monster, the Yool has several Christmas themed names: Feliz, the Spanish word for "merry"; Frawst, a pun of "frost"; Groodolph, a pun on "Rudolph"; Kringle, and Kris, references to Kris Kringle, a name for Santa Claus; Mizzletoe, a pun on "mistletoe"; Nog, a reference to eggnog; Puddin, a reference to Christmas pudding; Reignur, a pun on "reindeer"; and Rudy, an abbreviation of "Rudolph".
  • The Yool returned again in 2015 on December 3rd.
  • On December 2nd, 2015, the Yool was on sale for 75Diamond25px and was for early access for 24 hours.
  • On June 24, 2016, all Seasonal Monsters including Yool received a element. This addition of elements to Seasonal Monsters was not yet available in-game but was shown on a post My Singing Monsters put on social media. Each element design is based of the holiday the Seasonal Monsters are based of. According to that post, the Yool got a Christmas Tree. This can be further evidenced here.
  • The Yool is made to resemble Santa Clause, especially given its sound.

Breeding Eggs Feeding Likes

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