Tournament/Special Event Challenges

From time to time, Special Event Challenges will appear on the player's Tournament tab. Special Event Challenges are similar to Classic and Grand Victory Challenges, offering similar rewards and having similar rules while also possessing a similar matchmaking system separate from ladder play. However, special event challenges have certain special conditions and can have one-time rewards which can be won by reaching certain win counts for the first time in that challenge. If the Special Event Challenge ends and your current challenge attempt has not yet reached the maximum number of wins or 3 losses, you will be given the prize of your current number of wins.

Types
Note that multiple Challenge Types can stack as long as they don't conflict. Some of them have special rules:
 * Draft Challenge: A challenge in which players are given a choice between two cards and gets to keep one while giving the other to his/her opponent. Each player picks 4 cards. If a card is featured, one of the players will be guaranteed to get that card.
 * Double Elixir Challenge: A challenge in which Elixir generates at two times the normal speed throughout the whole game. However, players start with 0 Elixir instead of 5.
 * Triple Elixir Challenge: Similar to the Double Elixir Challenge, but Elixir generation rate is triple the normal rate.
 * Ramp Up Challenge: Elixir generation rate is normal at the first minute, double at the second minute, and triple from the third minute onwards.
 * Sudden Death Challenge: The game starts with 3 seconds left of normal time and then proceeds into a 3-minute Overtime. The match begins with double Elixir generation since it starts in the last few seconds of normal time.
 * Blind Deck Challenge: A challenge in which players are given a random deck generated by the game.
 * Built Deck Challenge: A challenge in which pre-built decks are given at random to each player.
 * Locked Card Challenge: A challenge in which players get to build a deck with any card in the game but have to use a specific card that is locked in the first slot. The player wins the featured card, often through one-time rewards.
 * Retro Challenge: A challenge in which players build decks exclusively with cards released before a certain date.
 * Mini Card Challenge: A challenge with only 3 or 6 wins at maximum that features a card, usually a common, rare, or epic. These challenges do not have free entries and give the featured card through one-time rewards. They usually cost 10 to enter. This type of challenge uses either the Draft Challenge rule or the Locked Card Challenge rule.
 * Card Rarity Challenge: A challenge in which random cards of a specified rarity are given through one-time rewards.
 * 2v2 Challenge: A challenge which has 2 players on each team. The King Tower usually has more HP than normal.
 * Mirror Challenge: Both players have the same random deck and have the same initial deck rotation. It also features the Mirror card, making the word "Mirror" a double entendre.
 * Touchdown Challenge: Uses Touchdown mode, where players aim for reaching the opponent's end zone instead of destroying Crown Towers.

The October 2017 Update added a Crown Tower skin to make Crown Towers have the Elixir Collector's producing animation. This skin is used in the Double Elixir, Triple Elixir and Ramp Up Challenges.
 * In 2v2 Draft Challenges (either regular or Touchdown), player Blue 1 and player Red 1 pick cards for each other, and so do player Blue 2 and player Red 2. If the Challenge has a featured card, it will be guaranteed to appear in both pairs of opposing players and will end up being contained in two player's decks. Players of the same team can see each other's card picking process, and one player can wait a few seconds to see his teammate's choice before making his own choice, in order to get a better card combination and/or to prevent the opposing team from doing so.
 * In 2v2 Mirror Challenges, player Blue 1 and player Red 1 get the same deck with the same initial deck rotation, and so do player Blue 2 and player Red 2. All four players have the Mirror card in the deck.

Past Special Event Challenges

 * 1) The first Special Event Challenge was the "King's Cup" named after the official tournament of the same name, which started on UTC 16:00 4/11/16 through UTC 16:00 8/11/16, lasting 4 days. It cost 5 to enter and players were given one free entry. In the King's Cup, players were assigned a random themed deck at the start of each round. These decks may contain cards the player does not own and also levels up or down any under-leveled or over-leveled card to tournament rules levels. This is a Built Deck Challenge.
 * 2) *Each deck contained 6 predefined cards and 2 random cards.
 * 3) *The table below lists the decks given to the player in the "King's Cup".
 * 4) The second Special Event Challenge was the "Double Elixir Challenge", which started on UTC 8:00 18/11/16 through UTC 8:00 21/11/16 and lasted for 3 days. Like the King's Cup Challenge, it cost 5 to enter and players were given one free entry. In this Special Event, players can choose whatever deck they like. As the name suggests, the Elixir regenerates at double the rate throughout the whole match. Players also start at 0 Elixir instead of 5. However, in the last minute of the match and in overtime, it still generates at 2 times the rate, not 4 times.
 * 5) The third Special Event Challenge was the "Blind Deck Challenge", which started on UTC 8:00 2/12/16 through UTC 8:00 5/12/16 and lasted for 3 days. Like both of the Special Event Challenges preceding it, it cost 5 to enter and players were given one free entry. In this Special Event, players were assigned a completely random deck at the start of each round, titled "Random Mix". Like the King's Cup Challenge, these decks may contain cards the player does not own.
 * 6) The fourth Special Event Challenge was the "Crown Duel Challenge", which started on UTC 8:00 16/12/16, and was playable in Friendly Battles on 15/12/16. Like the other Special Event Challenges before it, it cost 5 to enter and players were given one free entry. Players will not need to pay in friendly battles. In this Special Event, players may choose cards from two cards randomly given. The chosen one will be theirs while the other goes to their opponent's deck. They and their opponent select 4 cards, resulting in a total of 4 that you picked, and 4 that your opponent did not pick. This is a draft challenge.
 * 7) The fifth Special Event Challenge was the "Electro Wizard Challenge", which started on UTC 8:00 23/12/16 through UTC 8:00 26/12/16 and lasted for 3 days. But it was not playable in the friendly battle. In this Special Event, players may build a deck that contains Electro Wizard. They will have access to cards that they haven't unlocked yet, and all cards are adjusted to tournament rules levels. At 12 wins, you will receive the top prize which is guaranteed to include the Electro Wizard card, and the player will also be able to get the Electro Wizard card from other chests before its general release. This was a locked card challenge.
 * 8) *Unlike the other Special Event Challenges that preceded it, it had rewards equivalent to that of a Grand Challenge. Although the first entry was still free, it cost 100 for every subsequent entry.
 * 9) *It is also the first challenge that did not have a 50% discount. The previous challenges based on the Classic Challenge only required 5 of the 10 . The Electro Wizard Challenge cost the full 100 of the Grand Challenge.
 * 10) * This Challenge was the first challenge where you could get a guaranteed Legendary card at 12 wins. It was also possible to obtain another Legendary card out of the same 12-win Electro Wizard Challenge chest. This made it the only chest at that time that could contain more than one Legendary card at that time.
 * 11) The sixth Special Event Challenge was the "Double Elixir Challenge", which started on UTC 8:00 6/1/17 through UTC 8:00 9/1/17 and lasted for 3 days. It became playable in Friendly Battles on 5/1/17. The rules were the same as the second Special Event, but players weren't given a free entry, costs 50 for each entry, and the rewards were half of the Grand Challenge. Players will not need to pay in friendly battles.
 * 12) The seventh Special Event Challenge was the "Draft Challenge", which started on UTC 8:00 20/1/17 through UTC 8:00 23/1/17 and lasted for 3 days. It became playable in Friendly Battles on 19/1/17. The mechanics and gameplay of the challenge were identical to that of the Crown Duel Challenge. However, it had no free entries, but there were two versions of the Draft Challenge; a Classic Draft Challenge and a Grand Draft Challenge, which had the same entry costs and rewards as a Classic Challenge and a Grand Challenge respectively. It retroactively renamed the fourth Special Event Challenge, the "Crown Duel Challenge", to the "Draft Challenge". Players who participated in the fourth Special Event Challenge also had it listed as "Draft Challenge" in the tournament section of the activity log.
 * 13) The eighth Special Event Challenge was the "Battle Ram Challenge", which started on UTC 8:00 3/2/17 and lasted for 3 days, but was not playable in Friendly Battles. This was a locked card challenge in which players build a deck around the Battle Ram, locked in the first slot, in which they have access to all cards. The battle ram challenge was split into two types: Grand Battle Ram Challenge and Classic Battle Ram Challenge; the Grand Battle Ram Challenge has the same rewards as the Grand Challenge along with one-time rewards and the Classic Battle Ram Challenge having the same rewards as the Classic Challenge along with one-time rewards. The Grand Battle Ram Challenge takes 100 to enter whereas the Classic Battle Ram Challenge takes 10, but the Classic Battle Ram Challenge offers less one-time rewards and prize.
 * 14) The ninth Special Event Challenge was the Draft Challenge. It was available in Friendly Battles from 16/2/17 8:00 UTC until 20/2/17 8:00 UTC and the Challenge started on 17/2/17 8:00 UTC . This challenge is mostly identical to the earlier Draft Challenge, the only difference being that there is now a free entry for the Classic Draft Challenge.
 * 15) The tenth Special Event Challenge was a Draft Challenge. It was available in Friendly Battles from 2/3/17 8:00 UCT until 6/3/17 8:00 UCT and the Challenge started on 3/3/17 8:00 UCT.
 * 16) The eleventh Special Event Challenge was the "Bandit Draft Challenge" which started on UTC 8:00 17/3/17 and lasts for 3 days. The challenges gameplay was the same as the "Draft Challenge" but one of the players is guaranteed to have a Bandit as a selection. One twist about this challenge though, was that there are One Time Rewards. Once you get to a certain amount of wins you will be able to claim the rewards. If you restart the challenge and accrue wins up to the point of the one-time reward, you will not be able to claim them again. These rewards can be found in the table below.
 * 17) *It has half the rewards of a Grand Challenge, but has one free entry and then it costed 100 for every entry after that.
 * 18) *This is the first Special Event Challenge in which players can aim for the Challenge Chest, the Crown Chest and the Clan Chest simultaneously, as its duration almost coincides with a Clan Chest event.
 * 19) The twelfth Special Event Challenge was the "Retro Royale Challenge", which started on UTC 8:00 30/3/17. It costed 10 to re-enter and had one free entry. In this challenge, players built decks consisting of the original 42 cards that were present in Clash Royale's soft launch. Like all challenges that require building a special deck, players will have access to all eligible cards they do not have yet, and all cards are adjusted to Tournament level. Similar to the earlier Bandit Draft Challenge, there are One Time rewards. Unlike previous challenges, the top prize is obtained after achieving only 6 wins instead of 12. The Challenge Chest rewards at 6 wins are slightly higher than in a Classic Challenge.
 * 20) The thirteenth Special Event Challenge was the "Valkyrie Mini Challenge", which started on UTC 14:15 12/4/17 and lasted for 1 day. This was the first small card challenge and was a draft challenge. The one-time rewards were Valkyries at each of the 3 wins. There was no free entry. Each entry costed 10.
 * 21) The fourteenth Special Event Challenge was the Epic Challenge, which started on UTC 7:00 14/4/17 and lasted for 3 days. It had one free entry, and each subsequent entry costed 10.
 * 22) * The top prize is obtained after achieving only 9 wins instead of 12. The Challenge Chest rewards at 9 wins were slightly higher than in a Classic Challenge.
 * 23) * One-time rewards were Cards.
 * 24) * All cards the players have unlocked are usable. Players weren't forced to use a deck containing entirely of Epic cards in this Challenge.
 * 25) The fifteenth Special Event Challenge was the "Musketeer Card Challenge", which is a draft challenge started on UTC 9:00 19/4/17 and lasted for 1 day. The rules and rewards were similar to the Valkyrie Mini Challenge, the only difference being the card featured. This challenge takes 10 to enter.
 * 26) The sixteenth Special Event Challenge was the "Prince Card Challenge" which is a draft challenge that started on the 26/04/2017 and lasted for 1 day. It is similar to the other card challenges. The only difference is the card featured. Due to the different rarity of the Prince compared to the other previously featured cards, the one-time rewards were adjusted. This challenge took 10 to enter. The special stack offer offers 3 Princes for 200 gems and 6 Princes for 380 gems.
 * 27) The seventeenth Special Event Challenge was the "Heal Draft Challenge", which started on UTC 7:00 28/4/17 and lasted for 3 days. The rules and rewards are similar to the Bandit Draft Challenge, the only differences being the card featured and the one-time rewards. This challenge took 100 to re-enter after the free entry.
 * 28) The eighteenth Special Event Challenge was the Tombstone Card Challenge which started on UTC 7:00 3/5/17 and lasted for 1 day. The rewards are similar to the previous Card Challenges except the max wins is now 6 instead of the usual 3 in card challenges. This time, you build a deck with any cards you want as long as it uses the Tombstone (it is locked in the first slot). This challenge took 10 to enter. The stack offer offers 12 Tombstones for 50 gems and 100 Tombstone for 380 gems.
 * 29) The nineteenth Special Event Challenge is the Hog Rider Card Challenge which started on UTC 7:00 10/5/17 and lasted for 1 day. The rewards the same as the eighteenth Challenge, the Tombstone Card Challenge. This time, it is back to Draft mode instead of building your own deck with the featured card. The offer stack offers 200 gems for 50 Hog Riders and 380 gems for 100 Hog Riders.
 * 30) The twentieth Special Event Challenge was the "Double Elixir Draft Challenge", which started UTC 8:00 12/5/17. It is a combination of the Double Elixir Challenge and the Draft Challenge. It had one free entry. It costed 100  to re-enter and had half the rewards of a Grand Challenge as well as Gold as one-time rewards. The special pack offers a magical chest of your arena and 80 gems for the cost of $4.99.
 * 31) The twenty-first Special Event Challenge was the Wizard Card Challenge which started on UTC 7:00 17/5/17 and lasted for 1 day. The one-time rewards were Wizards. There was no free entry. Each entry cost 10 . The Wizard stack offers 50 Wizards for 4000 Gold and 100 Wizards for 7500 Gold.
 * 32) The twenty-second Special Event Challenge was the Mini P.E.K.K.A Card Challenge which started on UTC 8:00 24/5/17 and lasted for 1 day. The one-time rewards were Mini P.E.K.K.A. cards. There was no free entry. Each entry cost 10.
 * 33) The twenty-third Special Event Challenge was the "Night Witch Draft Challenge" which started on UTC 8:00 26/5/17 and lasted for 3 days. The challenges gameplay was identical to that of the "Bandit Draft Challenge"; the only difference was the card featured. Again, it had half the rewards of a Grand Challenge, but had one free entry and then it costed 100  for every entry after that.
 * 34) The twenty-fourth Special Event Challenge was the "Double Elixir Draft Challenge", which started UTC 8:00 9/6/17. It was the same as the previous Double Elixir Challenge, but was a Draft Challenge, like the Night Witch Draft Challenge. It granted one free entry.
 * 35) The twenty-fifth Special Event Challenge was the Witch Card Challenge which started UTC 8:00 14/6/17 and lasted for 1 day. The one-time rewards were Witches. It was a Draft Challenge.
 * 36) The twenty-sixth Special Event Challenge was the Fireball Challenge which started on UTC 8:00 21/6/17 and lasted for 1 day. The one-time rewards were Fireball cards. There was no free entry. Each entry costed 10 . It was a Locked Card Challenge rather than a Draft Challenge.
 * 37) The twenty-seventh Special Event Challenge was the "Bats Draft Challenge" which started on UTC 7:00 23/6/17 and lasted for 3 days. The challenge's gameplay was similar to previous Draft Challenges, the only differences were the card featured and the one-time rewards. As a common card, the sheer amount of cards gain were be higher. Again, it had half the rewards of a Grand Challenge, but had one free entry and then it costed 100  for every entry after that.
 * 38) The twenty-eighth Special Event Challenge was the Mortar Challenge which started on UTC 8:00 28/6/17 and lasted for 1 day. The one-time rewards were Mortar cards. There was no free entry. Each entry costed 10 . It was a Locked Card Challenge.
 * 39) The twenty-ninth Special Event Challenge was the "2v2 Challenge" which started on 30/6/17 and lasted for 3 days. It granted one free entry. Every entry after that costed 10.
 * 40) The thirtieth Special Event Challenge was the Furnace Challenge which started on UTC 8:00 5/7/17 and lasted for 1 day. The one-time rewards were Furnace cards. There was no free entry. Each entry costed 10 . It was a Locked Card Challenge.
 * 41) The thirty-first Special Event Challenge was the "2v2 Draft Challenge" which started on UTC 7:00 7/7/17 and lasted for 3 days. It granted one free entry, and each subsequent entry costed 10.
 * 42) The thirty-second Special Event Challenge was the Clone Card Challenge which started on UTC 7:00 12/7/17 and lasted for 1 day. The one-time rewards were Clone cards. There was no free entry. Each entry costed 10 . It was a Locked Card Challenge.
 * 43) The thirty-third Special Event Challenge was the "2v2 Sudden Death Challenge" which started on UTC 7:00 14/7/17 and lasted for 3 days. It granted one free entry.
 * 44) The thirty-fourth Special Event Challenge was the Royal Giant Card Challenge which started on UTC 7:00 19/7/17 and lasted for 1 day. The one-time rewards were Royal Giant cards. It was a Locked Card Challenge.
 * 45) The thrity-fifth Special Event Challenge was the 2v2 Double Elixir Draft Challenge which started on UTC 7:00 21/7/17 and lasted for 3 days. It granted one free entry.
 * 46) The thirty-sixth Special Event Challenge was the Balloon Card Challenge which started on UTC 7:00 26/7/17 and lasted for 1 day. The one-time rewards were Balloon cards. It was a Locked Card Challenge.
 * 47) The thirty-seventh Special Event Challenge was the "Cannon Cart 2v2 Draft Challenge" which started on UTC 7:00 28/7/17 and lasted for 3 days. It granted one free entry, and each subsequent entry costed 100.
 * 48) The thirty-eighth Special Event Challenge was the Knight Card Challenge which started on UTC 7:00 2/8/17 and lasted for 1 day. The one-time rewards were Knight cards. It was a Locked Card Challenge.
 * 49) The thirty-ninth Special Event Challenge was the "Triple Elixir Challenge", which started on UTC 7:00 4/8/17 and lasted for 3 days. It became playable in Friendly Battles on 3/8/17.
 * 50) The fortieth Special Event Challenge was the Mega Minion Challenge which started on UTC 7:00 9/8/17 and lasted for 1 day. The one time rewards were Mega Minion cards. It was a Locked Card Challenge.
 * 51) The forty-first Special Event Challenge was the "Legendary Challenge", which started on UTC 7:00 11/8/17 and lasted for 3 days. There were no special rules in battle. It had 1 free entry and cost 100 for subsequent entries, as well as one-time rewards. The 12 wins reward was a Legendary Chest, hence the name of this challenge.
 * 52) The forty-second Special Event Challenge was the "Crown Championship Challenge", which started on UTC 7:00 16/8/17 and lasted for 3 days. The challenge played normally with no special rules in battle but had a maximum of 20 wins. It had 3 free entries and costed 10 for subsequent entries, as well as one-time rewards. Players who managed to reach 20 wins qualified for the next phase of the Crown Championship, provided that they met the necessary terms and conditions beforehand.
 * 53) The forty-third Special Event Challenge was the Ice Spirit  Challenge which started on UTC 7:00 23/8/17 and lasted for 1 day. The one time rewards were Ice Spirit cards. It was a Locked Card Challenge.
 * 54) The forty-fourth Special Event Challenge was the Mega Knight Challenge, which started on 25/8/2017. Players were given one free entry. The challenge costed 100 for each subsequent entry. The challenge has one-time rewards. The rules are similar to the Electro Wizard Challenge, as players must build a deck that contains the Mega Knight. They have access to cards that they haven't unlocked yet, and all levels were adjusted to tournament standard. The Mega Knight was unlocked as a one-time reward for reaching 12 wins. Upon unlocking him, the player were able to receive more Mega Knight cards from Chests before his official release.
 * 55) The forty-fifth Special Event Challenge was the P.E.K.K.A. Challenge which started on UTC 7:00 30/8/17 and lasted for 1 day. The one time rewards were P.E.K.K.A. cards. It was a Locked Card Challenge.
 * 56) The forty-sixth Special Event Challenge was the Ramp Up Challenge which started on 1/9/2017 and lasted for 3 days. Players were given one free entry, and each subsequent entry costed 10 . The challenge had one-time rewards.
 * 57) The forty-seventh Special Event Challenge was the Giant Skeleton Challenge which started on UTC 7:00 6/9/17 and lasted for 1 day. The one time rewards were Giant Skeleton cards. It was a Draft Challenge.
 * 58) The forty-eighth Special Event Challenge was the 2v2 Mega Knight Challenge which started on 8/9/17 and lasted for 3 days. The challenge was played with Double Elixir and Draft with the Mega Knight as an option. Players were given one free entry and each subsequent entry costed 10 . The challenge has one-time rewards.
 * 59) The forty-ninth Special Event Challenge was the Rocket Challenge which which started on UTC 07:00 13/9/17 and lasted for 1 day. It was a Draft Challenge, and the one time rewards were Rocket cards.
 * 60) The fiftieth Special Event Challenge was the "Sudden Death Challenge", which started on UTC 07:00 15/9/17 and lasted for 3 days. In this challenge, Sudden Death occured three seconds after the match began, effectively meaning that the first player to destroy any Tower would win the battle. The one-time rewards were all Gold. It had one free entry, and each subsequent entry costed 100 .
 * 61) The fifty-first Special Event Challenge was the Goblin Barrel Challenge which started on UTC 07:00 20/9/17 and lasted for 1 day. It was a Draft Challenge, and the one time rewards were Goblin Barrel cards.
 * 62) The fifty-second Special Event Challenge was the "Flying Machine Draft Challenge", which started at UTC 07:00 22/9/17 and lasted for 3 days. It features the Flying Machine, and allows one of the players to use it during the match. It contains Gold and Flying Machine cards as one-time rewards, with the latter being obtainable from 8 wins and higher.
 * 63) The fifty-third Special Event Challenge was the Poison Challenge which started on UTC 07:00 27/9/17 and lasted for 1 day. It was a Draft Challenge, and the one time rewards were Poison cards.
 * 64) The fifty-fourth Special Event Challenge was the "Draft Challenge", which started at UTC 07:00 29/9/17 and lasted for 3 days. It didn't have a featured card, and ended at 9 wins.
 * 65) The fifty-fifth Special Event Challenge is the "Mid-Autumn 2v2 Draft Challenge", which started on UTC 07:00 2/10/17 and will last for 2 days. It's exclusive to Chinese players.
 * 66) The fifty-sixth Special Event Challenge was the Battle Ram Challenge which started on UTC 07:00 27/9/17 and lasted for 1 day. It was a Draft Challenge, and the one time rewards were Battle Ram cards.
 * 67) The fifty-seventh Special Event Challenge was the "2v2 Flying Machine Challenge", which started on UTC 07:00 6/10/17 and lasted for 3 days. The challenge was played with Double Elixir and Draft with the Flying Machine as an option.
 * 68) The fifty-eighth Special Event Challenge was the "2v2 Touchdown Challenge". It had three versions: a regular Challenge which started on UTC 7:00 10/10/17 and lasted for 3 days, an Elite Challenge which started on UTC 7:00 13/10/17 and lasted for 3 days, and a Daily Practice which started when the 9/10/17 update completed and ended on UTC 7:00 16/10/17. The regular Challenge had no free entries and cost 10 each time with the rewards of a Classic Challenge, the Elite Challenge had no free entries and cost 100  each time with half the rewards of a Grand Challenge, and the Daily Practice could be played for free once each day for a total of seven times, each time ended when 10 crowns are gained regardless of the number of losses.
 * 69) The fifty-ninth Special Event Challenge was the "Mirror Challenge". It had two versions. The Daily Practice started on UTC 7:00 17/10/17 and lasted for three days, and could be played for free once each day during the Event for a total of three times, each time ended when 6 crowns are gained regardless of the number of losses. The real Challenge started on UTC 7:00 20/10/17 and lasted for three days, had no free entries and cost 100 each time with half the rewards of a Grand Challenge.
 * 70) The sixtieth Special Event Challenge was the "King's Cup". It started on UTC 7:00 25/10/17 and lasted for five days. It had three versions: a practice that ended after 10 crowns were gained regardless of the number of losses, a normal Challenge that had one free entry, cost 10 each time after that and ended at 6 wins, and an Elite Challenge that cost 100  each time and ends at 9 wins. Each phase must be completed to enter the next phase.
 * 71) The sixty-first Special Event Challenge was the "Halloween Draft Challenge". It was a Draft Challenge that allows one player to use the Skeleton Barrel before its general release. It started on UTC 7:00 31/10/17 and lasted for three days. It had one free entry, cost 50 each time after that and ended at 9 wins. It had one quarter the rewards of a Grand Challenge. One-time rewards were 9 of the 11 cards associated with skeletons, excluding the Bomber and the Graveyard. Players got a chance to unlock the Skeleton Barrel before its general release. The Arena setting was always the Spell Valley (Arena 5) decorated with a few Skeleton Barrel's balloons.
 * 72) The sixty-second Special Event Challenge was the "Double Elixir Challenge". It started on UTC 8:00 9/11/17 and lasted for four days. It had two versions: a normal Challenge that had one free entry, cost 10 each time after that and ended at 6 wins, and an Elite Challenge that cost 50  each time and ended at 9 wins with one quarter the rewards of a Grand Challenge. The normal Challenge had to be completed to enter the Elite Challenge. The Arena setting was always the Legendary Arena (Arena 11).
 * 73) The sixty-third Special Event Challenge was the "2v2 Mirror Challenge". It started on UTC 8:00 14/11/17 and lasted for 2 days.
 * 74) The sixty-fourth Special Event Challenge was the "2v2 Touchdown Challenge". It started on UTC 8:00 23/11/17 and lasted for 4 days. It has one free entry and cost 50 each time after that.
 * 75) The sixty-fifth Special Event Challenge was the "Crown Championship Finals Challenge". It started on UTC 8:00 29/11/17 and lasted for 4 days. It had one free entry and cost 10 each time after that. It ended at 20 wins like the forty-second Special Event Challenge.
 * 76) The sixty-sixth Special Event Challenge was the "Sudden Death Challenge". It started on UTC 8:00 7/12/17 and lasted for 4 days. It had one free entry and cost 100 each time after that.
 * 77) The sixty-seventh Special Event Challenge was the "Zappies vs Hunter Challenge". It started on UTC 8:00 12/12/17 and lasted for 3 days. It had one free entry and cost 100  each time after that. As a Draft Challenge featuring two cards, they always appear as a drafting pair, so they appear in opposing players' decks. The Arena setting was always the Electro Valley (Arena 11).
 * 78) The sixty-eighth Special Event Challenge was the "Triple Elixir Challenge". It started on UTC 8:00 19/12/17 and lasted for 2 days. It had one free entry and cost 50 each time after that.

 * The chest rewards are based on your current Arena (except Legendary Chests) and can be instantly opened.