| abstract | - The Endless Zone is an game mode about infinite rounds in Bloons Tower Defense: A Doctor's Tale You unlock the Endless Zone of its respective world everytime you complete a world.
- Endless Zones (also referred to as Danger Rooms; Challenge Zones in the old version) in Plants vs. Zombies 2 are sets of endless levels that will increase difficulty as the player progresses. The main idea of Endless Zone is purely similar to Survival: Endless, where in an unlimited number of zombies will make an effort in reaching the player's house. All zombies are listed as belligerents excluding Dr. Zomboss and his creations. While it is a notable similarity, there are notable differences. In Survival: Endless, there is only one level and one setting, there are only two flags per wave, sun bank is retained, no rewards will be collected, lawn mowers cannot be replenished, and placed plants on the first two waves are retained but the player is then given a chance to regroup and re-choose their corresponding arsenals. Since placed plants from the beginning are retained, when the next onslaught starts, zombies will immediately come in large groups. Finally, there are 22 zombies all in all listed as belligerents for the level. On the first two levels, it will select the basics (i.e. Conehead Zombie and Buckethead Zombie). It will be then shuffled and will select more until all zombies are encountered, from which there will be 9-10 random zombies will be selected and will be deployed for an onslaught. Meanwhile, the Endless Zone portrays an identical feature but with few differences. The player will start with either three or four plants automatically given to them as they start. From there, (assuming all plants have been obtained) there will be either 90 or 91 cards to choose from, depending on how many starting plants are given and how many plants are omitted. Plants are typically omitted from the endless zone when their use will being invalidated due to their usage not being usable on a certain location. The cards will flash four random plants with three face-up and one face-down and requires paying 2000 coins to view. As the player progresses, they get to pick one more card until the cards show power-ups, Plant Food, sun bank, or lawn mower. Furthermore, the player can replenish their lost lawn mowers, a feature that Survival: Endless does not possess. Also, in all levels no matter how high it is, the level always starts the onslaught by deploying a single Basic Zombie (sometimes Ra Zombie or an Imp variant) across the lawn and the next set of zombies will be deployed after a certain period of time of delaying to kill it or by killing it immediately (if the first zombie is Imp, it will instantly spawn the next wave of zombies). Also, as each level passes, all placed plants on the lawn will be cleared and the sun bank will reset to 50, 75, or 100. Instead, plant food and lawn mowers are retained on next levels until they either failed to fill in all slots for Plant Food or they lose a lawn mower by intentional (either by last resort or by mower launch upgrade) or accidental (mower launch upgrade). Finally, unlike Survival: Endless, the endless zone has 11 different settings, each of which is listed below. At higher levels (around 20 and up), exactly one Plant Food from the zombies will be given to the player each wave.
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