Chests

Summary

 * Earn chests to unlock rewards, earn Gold, collect new Cards and upgrade existing cards.
 * Silver, Golden, Giant, Magical, Epic, Legendary, and Super Magical Chests can be earned by winning battles after the tutorial.
 * Free and Crown Chests are available periodically, but Crown Chests require earning a certain amount of crowns to unlock.
 * Tournament Chests are earned by placing in the top 20% of a Tournament.
 * Challenge chests are earned by the number of wins in a Challenge. Each time you win, the reward increases.
 * Each player has four chest slots, so you can only have up to four chests waiting at a time. It is still possible to battle when your chest slots are full, but no chests will be won, only Gold.
 * All chests have better rewards at higher Arenas (except Legendary Chests, which contains one legendary card regardless of Arena).
 * Chests always contain cards from the Arena the player got them in and below (except for Legendary Chests, which can contain a Legendary Card from any Arena). Unlocking a new Arena (apart from the Legendary Arena) adds new Cards to the Chest rewards - none are taken out.
 * Only Free and Crown Chests can contain Gems.
 * Crown and Free Chests contain cards from the Arena you open Chest in (and lower arenas).
 * For example, a Free Chest arrives when you are in Arena 6. If you win several battles and advance to Arena 7 it will contain the rewards from Arena 7 (and lower arenas), and if you lose several battles and drop to Arena 5 and then open the Free Chest, it will contain rewards from Arena 5 (and lower arenas). Similarly, the rewards of a Crown Chest depends on the Arena you are in when you open it.

Rarity

 * Rare Cards are 10 times rarer than Common Cards.
 * Epic Cards are 20 times rarer than Rare Cards and 200 times rarer than Common Cards.
 * Legendary Cards are 20 times rarer than Epic Cards, 400 times rarer than Rare Cards and 4000 times rarer than Common Cards. Source
 * Any chest, besides Legendary Chests, can contain Epic Cards.
 * Any chest from P.E.K.K.A's Playhouse (Arena 4) or higher, besides Epic Chests, can contain a Legendary Card.
 * The only exception is if you get a Legendary Chest, which can contain a Legendary Card from any Arena.

Free Chest

 * Free Chests are awarded for free every 4 hours.
 * Uncollected chests will stack (maximum 2) for unlocking the next time the player is online.
 * After you have 2 Free Chests waiting, the timer for the next Free Chest will be stopped until you collect one of your waiting Free Chests.
 * Free Chests can contain 2-3 Gems.
 * Free Chests contain about the same rewards as a Silver Chest of the same arena, but contain more Gold, and have triple the chance of containing an Epic or Legendary compared to a Silver Chest.
 * They also have a guaranteed Rare card from Frozen Peak onwards.

Crown Chest

 * The Crown Chest is unlocked after you win 10 crowns in battles.
 * Note that Crowns won from Friendly Battles and Training Battles will not count toward this total.
 * It has approximately double the rewards of a Gold Chest, and about 2/3 of the rewards of a Magical Chest (not counting the Epic Cards). They also have triple the chances of containing an Epic or Legendary card compared to a Gold Chest.
 * The Crown Chest has a 24-hour cool-down that starts as soon as the previous one becomes available. This allows for a new chest to be opened at the same time every day.
 * Training Battles will stop the cool-down timer from counting down.
 * Uncollected chests will stack (maximum 2) for battling the next time the player is online.
 * Note that when two chests are stacked, Crowns from one chest can overflow to the next after the first one is unlocked.
 * After you have 2 Crown Chests waiting, the timer for the next Crown Chest will be stopped until you collect one of your waiting Crown Chests.
 * Crown Chests always contain 2-4 Gems.

Silver, Golden, Giant, Magical and Super Magical Chests

 * Chests won from battles after the tutorial can be Silver, Golden, Magical, Giant, Epic, Legendary or Super Magical Chests.
 * The cost to purchase Magical, Giant, or Super Magical Chests from the shop increases based on the Arena the player has unlocked. The higher the arena is, the higher the cost, since Chests from higher arenas contain more rewards.
 * However, they are basically cheaper at higher Arenas on a "Gem cost per Gold/Card" basis.
 * The Silver Chest has no guarantee on the rarity of the cards you will get (the only exception is the Legendary Arena, which guarantees 1 Rare). The Golden Chest guarantees a few Rares, the Magical Chest guarantees Rares and Epics, the Giant Chest guarantees a large number of Rares. Super Magical Chests guarantee the highest number of Rares and Epics and also have the second-highest chance of obtaining a Legendary Card!

Epic and Legendary Chests

 * Epic Chests and Legendary Chests can be obtained from the Shop through special offers, as well as from winning battles.
 * In the Shop, Epic Chests cost varying amounts of Gold depending on the Arena. It costs 500 Gold for every Epic card inside the Epic Chest. For example, an Epic Chest in Builder's Workshop (which contains 15 Epics) will cost 7,500 Gold.
 * Legendary Chests cost 500 Gems in the Shop.
 * They both contain only cards of a single rarity; Epic Chests will only contain cards while Legendary Chests will only contain a single, yet guaranteed  card. Neither of these chests will contain Gold.
 * These are the only two chests that cannot contain Common or Rare cards.
 * The Epic Chest is the only chest that can be bought for Gold.

Chest Cycle

 * Chests are not determined by chance, they are determined by a cycle.
 * The cycle only advances if you have at least one chest slot empty. You must have a chest slot open to get the next chest and move forward in the cycle.
 * There are 180 Silver Chests, 52 Golden Chests, 4 Magical Chests and 4 Giant Chests in the 240 chests cycle.
 * Super Magical Chests are on a separate cycle.
 * After the player reaches 400 Trophies, the Super Magical Chest cycle will begin counting the number of chests that the player obtains through the regular chest cycle.
 * The Super Magical Chest cycle is 500 chests long. At some point in those 500 chests, a Super Magical Chest will be awarded. The Super Magical Chest can drop at any point in the 500 chest cycle, and only one Super Magical Chest can be won per batch of 500 chests.
 * Dropping below 400 Trophies again will not stop or reset the Super Magical Chest cycle.
 * When a Super Magical Chest is earned, it will replace the chest that you would have obtained from the regular chest cycle.
 * Epic and Legendary Chest cycles work similarly to Super Magical Chests.

History

 * On 29/2/16, the March Update added the Giant and Super Magical Chests.
 * Before it, Silver and Golden Chests were available in the Shop in place of the Giant and Super Magical Chests.
 * On 3/5/16, the May Update doubled the rewards of the Crown Chest and doubled the chance of getting a Super Magical Chest.
 * It also reduced by 20% the gold into all the chests with the exception of Crown/Free.
 * In addition, it modified the chest cycle to have one extra Giant Chest and one extra Magical Chest, at the cost of two Golden Chests.
 * Furthermore, before this update, the Super Magical Chest cycle was 1000 Chests long, the update effectively cutting it in half, and resetting all players' locations in the cycle.
 * On 4/7/16, the July Update made a small tweak to Gold in chests. It also added a new type of Chest: the Tournament Chest, won by placing in the top 20% of a tournament.
 * On 19/9/16, the September Update added the Epic and Legendary chests.
 * It also made Crowns overflow to the next Crown Chest when 2 Crown Chests are available.
 * For example, if you have 9 Crowns then get a 3 Crown win, the next Crown Chest will have 2 Crowns filled from the overflow.

Trivia

 * Since you can hold up to 2 Free Chests, you can log in once every 8 hours to collect without losing any possible "Free Chest time". This also means you can get up to a maximum of 6 Free Chests per day.
 * Wooden Chests can not be obtained by winning battles, except in the tutorial.
 * After winning the fourth match in the tutorial, it rewards you with a chest that guarantees you with an Epic Card.
 * Instantly opening a chest always costs 1 Gem per 10 minutes, rounded up. Skipping longer waiting time doesn't decrease the gem cost divided by time.
 * If you decide to instantly unlock a chest, the best times to unlock it are every 10 minutes after unlocking it.
 * Because of the respective amounts, buying a Super Magical Chest can be considered as buying six Magical Chests at once (disregarding small differences due to rounding) and at a discount, as the Super Magical Chest's price is slightly lower than six times the Magical Chest's price at the same Arena, just like buying a wagon of gold can be considered as buying ten buckets of gold at a 10% discount.
 * The amounts of gold in Free Chests and Crown Chests are 7-8 times the number of cards they contain, while battle chests get 5-7 times as much gold as cards.
 * The silver color of the Silver Chest could refer to the fact that it contains mostly common cards; the gold (orange) color of the Golden, Crown and Giant Chests could refer to the rare cards they guarantee; the purple color of the Magical, Super Magical and Epic Chests could refer to the Epic cards they guarantee; the glowing effect of the Legendary Chest could refer to the Legendary card it guarantees.

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