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Icebound Battleground is the fourth Endless Zone in Plants vs. Zombies 2 found after beating Frostbite Caves - Day 20. As is the case with other endless zones, this one sports more challenging levels than usual as one may not know when the level will have either a three or four-flag level. As the player progresses as well through the higher levels, freezing winds may occur more often and be more violent, and may press harder on the player's well defended columns.
For this Endless Zone, you should take plants that can melt the ice caused by Hunter Zombies and the freezing wind effect. Dodo Rider Zombies and Ice Weasels can jump over ice floes and cause your lawn defense to be swarmed, so pay attention to them or you will lose the game before you use Power Ups or Plant Food. The frozen zombies can also be dangerous and can cause problems if you melt the blocks too early.
Hunter Zombies, Sloth Gargantuars, Troglobites, Weasel Hoarders, Dodo Rider Zombies, Blockhead Zombies, and Ice Weasels are very dangerous in this Endless Zone. If all are present in one level, they can easily be very overwhelming. Freezing winds can also be very problematic, as they can often disable a great portion of the lawn, leaving you defenseless. This is especially problematic against Ice Weasels, since they can charge right through your frozen plants, causing you to lose Lawn Mowers or even lost the Endless Zone.
Lightning Reed is a good choice in this Endless Zone, as it can electrocute the Ice Weasels in a similar manner to the Chicken Wrangler Zombies and their Zombie Chickens in Big Bad Butte and other Wild West levels. Spikerock is also a good plant to use against Weasel Hoarder. However, unlike with Zombie Chickens, the increased health of Ice Weasels makes Lightning Reed difficult to use. A Laser Bean on the back most column or Fume-shrooms adjacently placed to Sweet Potatoes to lure all Ice Weasels are also good choices. Place two Sweet Potatoes and Fume-shroom at second and fourth rows but keep a Fire Peashooter or a Torchwood to keep them warm or the winds will eliminate them in one or two blows, especially on higher levels. Take Hurrikale or Chard Guard too in order to repel zombies pushed by sliders.
Troglobite is a very dangerous zombie. Hot Potatoes are the highest priority, so melt all the frozen Yeti Imps quickly or your powerful plants will be destroyed by it. Without it, this zombie can cause the mass destruction of your defenses. Jalapeno (if purchased) is good against Troglobites because it destroys all three ice blocks along with the Troglobite itself.
Dodo Riders can cause problems without Blover or Hurrikale to blow them away. Note that Spikeweed, Spikerock, and Lava Guava do not work on Dodos unless placed directly behind sliders or defensive plants.
Sloth Gargantuars are harder to kill than other Gargantuar variants, thanks to the extra two Imps it throws. This makes them the greatest threat of Icebound Battleground. Avoid using Magnifying Grasses as your only offensive plants, as their attacks do not do splash damage and you will waste more sun if you kill its Yeti Imps, because it takes more sun to kill this variant. Chard Guards can also repel them to prevent your plants from being crushed. Immediately use Plant Food on your Chard Guards if the Gargantuars are attacking at once. Should you feel the possibility of them appearing at higher levels in larger numbers, a boosted Iceberg Lettuce or Stallia will come in handy as they will slow down Gargantuars from constantly throwing Yeti Imps deep to your defenses, while allowing other plants to do more damage. Try to use Blover to instantly blow away all thrown Yeti Imps at once.
For Levels 20 and beyond, you must take very powerful plants such as Banana Launchers, Winter Melons and Jack O' Lanterns. These plants can help deal massive damage to larger hordes of zombies if you are in danger. Power Lily is also highly recommended, because Plant Food is very scarce in higher levels. Magnet-shrooms can also be useful if you see a lot of Cave Buckethead Zombies. One can use a Plant Food to remove their buckets, making those zombies very easy to defeat. Freezing winds can be a huge problem at higher levels when a horde of zombies is advancing. Plant more than two rows of a thawing plant, such as Fire Peashooter, Torchwood, or Lava Guava, with your attacking plants between them to maximize the thawing rate, or you will have to use Hot Potato to melt your most powerful plants first to buy time for Hot Potato to thaw the others.
If you get all the threats in one level, keep in mind that it is immensely difficult to pass during higher levels without having boosts or Power Ups. To avoid wasting lots of coins, it is advised to have premium plants (such as Power Lily, Torchwood, Hypno-shroom, Ghost Pepper if bought, Hurrikale, or Explode-O-Nut) or single-use plants (such as Cherry Bomb, Bombegranate or Grapeshot) to prevent the zombies from advancing.
As you go through the levels, prioritize getting these plants, in order from most important to least: Pepper-pult, Gold Bloom, Electric Currant, Fire Peashooter, Sun-producer (preferably Sun-shroom or Primal Sunflower), Rotobaga (or Starfruit if available, Phat Beet is not as effective but may be used), Guacodile (or Parsnip/Jalapeno if available), Lava Guava, Imitater, defensive plant (preferably Infi-nut), Spikeweed/Spikerock (Cactus if available too)
With these plants, you can usually create setups to adapt to a level's layout. For example, levels containing sliders that funnel zombies into the middle lanes are perfect for using Electric Currant. If sliders funnel into the bottom or top lanes, Rotobaga/Starfruit are effective. However, there are a few plants that are necessary for each setup: Pepper-pult, Gold Bloom, Sun-producer, Defense, Lava Guava, Hot Potato.
This leaves one to two empty slots, depending on whether you have the eighth seed packet. You can fill these slots with specialties to deal specifically with the Zombies or layout you are given. Plants and layout changes are labeled from most urgent to least urgent.
- Zombies funneled to middle: Electric Currant, Starfruit, Rotobaga
- Zombies funneled to outside: Starfruit, Rotobaga, Phat Beet
- Troglobite: Guacodile/Parsnip/Jalapeno
- Weasel Hoarders: Spikeweed/rocks, Cactus
- Gargantuars: Imitated Lava Guava
- Extra Heat: Fire Peashooter, Imitated Lava Guava
Versatility and adaptability are the keys in this strategy, so the most plants you have the more prepared you will be. Power Lily, although not mentioned is worth bringing. Winter Melon was not mentioned because its freeze would be counteracted by Pepper-pult.
Plants vs. Zombies Wiki has a gallery for Icebound Battleground.
- It has Crazy Dave's longest first-time endless zone speech.
- Before unlocking, the stage resembles a giant snow-capped chunk of ice.
- The player can get any plants frozen in ice blocks, including ones that they have not unlocked yet.
- Icebound Battleground, Tiki Torch-er, Arthur's Challenge, and Greatest Hits are the only Endless Zones whose names are composed of two words.
- According to game code in the 3.2 update, it was planned to be called "Frozen Fear".
- Icebound Battleground, along with Temple of Bloom, Tiki Torch-er, Arthur's Challenge, La Brainsa Tarpits and Highway to the Danger Room are the only Endless Zones to have different or extra starting plants, in this case Hot Potato.
- It is the second Endless Zone where the first zombie is not always a Basic Zombie variant (in this case, also Yeti Imp), with the first being Pyramid of Doom.