<P> The game is controlled similarly to a twin - stick shooter: the player moves their character around the screen while they are able to shoot the tears that they cry in another direction . These tears act as bullets to defeat enemies that try to harm the player - character . The player - character's health is tracked by a number of hearts: the character can find items that can replenish hearts while others grant the character additional hearts, extending their health . Throughout the dungeons the player - character will find bombs, which can be used to both damage foes and blow up obstacles, keys to open certain doors and treasure chests, coins to buy items at various stores, and a large number of items that impact the character's attributes, such as speed and the damage and range of their tears, and other gameplay effects, such as gaining a character that floats behind the player - character and aids in combat . Some of these items are passive, others are active and reusable, requiring the player to wait a number of rooms before they can reuse it, while others are single use items that disappear after use . The player can typically collect any number of passive items, their effects stacking on previous ones, potentially creating powerful combinations for the player . Otherwise, the player can only carry one reusable item and one single - use item, replacing it for another if they pick such up . Among other rooms within the dungeons include special challenge rooms and mini-boss fights . </P> <P> In addition to expanding greatly on the number of items, monsters, and room types (including those that span multiple screens) from the original game, Rebirth provides integrated support for controller support . Rebirth allows for a second local player to join in on a drop in / drop out mechanic . While active, the second player controls a follower of the first player - character that has all of the same attributes and abilities of that character, though will cost the first player - character one heart to use which is given to the follower character . This second character, however, cannot plant bombs or carry items . Rebirth also provides a feature that allows players to enter the random seed for a run, which will regenerate the same dungeon with the same items and monster population when used . The player is presented with this seed after completing a run, or when the game is paused, which they can reuse again or share with others . </P> <P> The plot in Rebirth remains the same as the original game, following along the biblical tale of the same name . The young boy Isaac had been living happily with his mom . One day, spurred on by watching too many religious programs on the television, his mom believed she received instruction that Isaac had become corrupted and she must try to save him . First, she removed all his possessions, including his toys and clothes, believing these were corrupting him . Later, she locked him in his room to never be let out so as to protect him from the evils that existed outside . After hearing the further instruction that to show her devotion to her faith she must sacrifice her son, Isaac flees from his approaching mother through a trap door into the basement, leading to the events within the game . </P> <P> The Binding of Isaac was originally developed by Edmund McMillen and Florian Himsl in 2011 from an internal game jam following the completion of McMillen's previous game, Super Meat Boy . With Super Meat Boy being successful, McMillen had not concerned himself with making a popular game, and instead wanted to craft a game that melded the top - down dungeon approach of The Legend of Zelda with the roguelike genre, wrapping that in a religious allegory based on his own childhood experiences . They used Adobe Flash as it enabled them to develop the game quickly . McMillen quietly released the game to Steam for personal computers, where it proved to be very popular . Looking to expand the game, McMillen and Himsl discovered limitations on Flash that made expansion difficult . Though they were able to incorporate more content through the Wrath of the Lamb expansion, McMillen had to forego a second planned expansion due to the Flash limitations . </P>

What is the story of binding of isaac
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