Chocobo ' s Crystal Tower Chocobo ' s Crystal Tower was a flash game developed by Square Enix playable as a FaceBook app . The player could raise a chocobo , battle monsters to earn gil and then customize their chocobo with unique accessories . Players were able to look after each other ' s chocobos and different players ' chocobos could mate with each other . The game was taken offline 13th February 2012 with promises it would return , but it never did . Story . An evil wizard called Evilzard had summoned the Meteor of the Apocalypse , but a brave hero shattered the Meteor and save the world . The Meteor shards fell across the land , spawning an intricate network of towers and dungeons . Monsters crawled out of the towers , spreading fear . Many adventurers tried to destroy the monsters and the towers , but a black curse left by Evilzard before his death prevented them . One day , a chocobo emerged from one of the towers , heavily wounded . It had ventured inside and vanquished the monsters within , because the tower was silent . This chocobo , Boco , was hailed as a national hero of Enisque , and since then , the kingdom of Enisque started a chocobo breeding program , sending chocobos into the tower one after another . The program was a success , and novice royal chocobo breeders have since come in droves to breed and train the chocobos to continue their quest to destroy the towers . Elena Xequs , one of the royal chocobo breeders , trains novices in the breeding program . Shopkeepers , such as Botteli , sell greens to feed the chocobos . Gameplay . Character growth revolved around the player visiting their chocobo ( s ) on a regular basis and feeding them the various color Gysahl Greens raise their stats , and brushing their feathers to keep them clean . To begin raising a chocobo , the player had to place an egg into the provided nest ( the player could unlock more nests when they progressed through the game ) . After a set period of time , the egg hatched into a chocobo chick . The player could have more than one chocobo on the farm at one time . The player ' s role was to ensure that a chocobo reaches adulthood so that it can be sent into one of the many towers to vanquish the monsters inside and claim whatever treasures it may find . As the chocobo grew , the player was awarded with achievement trophies and experience points , the latter of which slowly filled up an EXP bar at the top of the screen . If the bar was filled up , the player ' s Breeder Rank was increased by one . Ways for the player to earn experience included brushing and feeding their chocobo , brushing and feeding other players ' chocobos , placing feathers on other players ' chocobos and clearing towers . In addition to these features , players could customize the farm their chocobos live on by purchasing different objects and backgrounds from the shop using gil . From the same shop , players could also buy gysahl greens and equipment / battle gear for their chocobo ( s ) . Each day the shop had a new item at a reduced price on display , which could be bought once . Gil ( and an assortment of gysahl greens ) was awarded to the player if they logged into the game on each consecutive day , in what was known as a " daily login bonus " . Gil and golden feathers were awarded when the player ' s Breeder Rank increased . Special items in the shop could be purchased with " Chocopoints " , which had to be bought with real money . Life span . Each chocobo had a lifespan . Below is the list of each stage in a chocobo ' s life , the length of the stage , and what is available during that time : Feeding . Throughout its lifespan , the player ' s chocobo ( s ) required daily feeding . Each color of gysahl raised a different stat , with the exception of the yellow gysahl , which raised all stats slightly . A gysahl added thirty points to the chocobo ' s hunger bar . The list of gysahls and their effects features below : If a chocobo are a gysahl corresponding to the color of its feathers , the effect of that gysahl was multiplied . Along with gysahls , the player could find vegetables to feed their chocobo . These did not give them as much experience as gysahls , nor were they very filling to the chocobo , but they were reasonably cheaper than gysahls . A vegetable added twenty points to the chocobo ' s hunger bar . The list of vegetables and their effects features : Breeding . Adult chocobos could be bred to create eggs for the owner . Chocobos on the same ranch could not breed together . Breeding the player ' s chocobo had no downsides or side effects , it just gave the player another egg to hatch into a chick to expand the flock . There were two ways to breed a chocobo . When the player had a successful breeding , they received an egg in a free egg box . If the player did not have a free egg box , the game did not allow the player to initiate a breeding . To hatch the egg , the player had to drag and drop it onto a nest . If the player had no available nests , they could buy more when they reached certain levels . The player then needed to wait for the egg to hatch . If the player got an egg of a certain color , it did not mean that color chocobo would hatch from it . If both parents of the egg were the same color , it had a high possibility that the offspring would also be that color . A white egg had a chance to be any color chocobo . Black chocobos and white chocobos were rare . Lucky feathers . Lucky Feathers could be acquired from logging in daily , visiting friends ' farms daily , and searching towers with one ' s chocobo . The feathers could be used to expand the number of egg boxes , or how many chocobos the player ' s farm could hold . The player could place up to three of them on a chocobo they did not own . Doing this was considered charitable , and could help out other players . The player could not place feathers on their own chocobos , only on other people ' s ( including random users ) . Should someone place a feather on the player ' s chocobo , they needed to remove them . The chocobo received 15 points of Luck for every feather removed from it . The player also received 20 gil and 10 experience each time a feather was removed from one of their chocobos . One could remove feathers from any chocobo granted the player did not place any feathers on the chocobo .