Isaac will be forced to fight through 15 waves of Bosses (that is, if they don't teleport, use We Need To Dig Deeper, etc.), each wave containing two Bosses. If Isaac chooses to take an Item, the rest of the Items will disappear and Boss Rush will begin. Upon first entering the room, four Item Pedestals will be seated in the middle of the Room. Boss Rush is located in a secret room that is only accessible after defeating Mom in under 20 minutes. Some Bosses' difficulties have been toned down a bit as Monsters, an example being Gurglings.ДЄll Bosses that were not introduced in Rebirth can be found during Boss Rush, with the exception of Isaac (Boss), Blue Baby (Boss), Mom, Satan, Scolex, and Krampus.

They do not drop Passive Collectibles or many Red Hearts on death. They are generally in pairs, especially in advanced Floors such as The Chest and The Darkroom. Most Bosses can be found as Monsters on later Floors in the game. Said Bosses also do not drop many Red Hearts on death. These Bosses are considered Monsters, for they do not drop Passive Collectibles upon dying. When Isaac either opens one of these Chests or takes an Item, they will engage in a battle with 2-3 waves of Bosses. Boss Challenge Rooms generally have Chests or Item Pedestals in the middle of them. Most Bosses can also be found as Monsters in Boss Challenge Rooms, Rooms that can only be entered when Isaac has 1 Red Heart Container or less. When Bosses spawn in Boss Rooms, they can occasionally spawn alongside one or two Monsters. Boss Rooms cannot be exited once entered unless either the Boss is defeated or Isaac is teleported to a different Room, with few exceptions, one exception being if the player uses Dad's Key. Also after killing a Boss in a Boss Room, a Devil or Angel Room has a chance to spawn.Д«osses can appear in a variety of Rooms in different forms.Д®very Boss can be found in a Room called a Boss Room (with the exception of Mega Satan, Krampus, and The Angels), in which Isaac must engage in a Boss Fight to advance to the next Floor, with few exceptions around this, one of these exceptions being the We Need To Dig Deeper Item. After killing a Boss in a Boss Room, the door will open and a trapdoor to the next floor will spawn. The chance of Bosses dropping Red Hearts on death are greatly reduced on Hardmode. Bosses also drop Red Hearts on death, with few exceptions (some Champion Bosses dropping one Soul Heart). Bosses generally have relatively high health compared to that of Monsters and drop a Passive Collectible upon dying, this Passive Collectible generally being either a Damage Up or an HP Up.

Binding of isaav turdlings