Angry Birds 2/Version History

Ver. 2.6.6 - April 15, 2016

 * WWF Campaign. 100% of proceeds from In-App Purchases will go towards WWF until April 24th.
 * Special WWF Level (level 10).
 * Special WWF spell (unlocks at level 13).

Ver. 2.6.8 - April 24, 2016

 * Removed WWF Campaign.

Ver. 2.7.1 - May 19, 2016

 * New chapters: The Hamalayas and Madagooscar
 * New Pig: Gravity Pig.
 * Win streaks: get rewards for consecutive wins in the Arena.

Ver. 2.8.1 - July 14, 2016

 * Angry Birds 2 1st Birthday event.
 * New Birthday hats.
 * New Avatars.
 * New Daily Quests.
 * The Ring of Fire. Turns burds into flaming birds, which blow up on impact.
 * New chapters: Hamberg and Oinklahoma

Ver. 2.8.2 - July 26, 2016

 * Fixed a bug relating to spells

Ver. 2.8.3 - August 4, 2016

 * Bug fixes

Ver. 2.9.0 - September 8, 2016

 * New pirate, beach and school themed hats.
 * The King Pig Panic has been introduced.
 * Fixed odd pig behaviour.
 * Added "Beam" pigs.
 * New chapters: Hamazonas and Copacabacon

Ver. 2.10.0 - October 27, 2016

 * Halloween 2017 update.
 * More feathers in chests, daily challenges and the arena.
 * New hats (Halloween, Medieval and Wig)
 * New chapter
 * New card tier

Ver. 2.10.7 - November 30, 2016

 * (RED) update.
 * New (GEM PILE)RED purchase - 100% of purchase goes towards the fight against AIDS.
 * New hats - (RED) mask set.
 * Special limited-time spell - FEATHE(RED) FLURRY

Ver. 2.10.9 - December 7, 2016

 * Removed (RED) campaign.

Ver. 2.11.0 - December 22, 2016

 * Introduced the Tower of Fortune.
 * New 'Pristine' card tiers.
 * New slingshot tiers.
 * New hats - Christmas, Winter and Fancy hats.
 * 80 new levels - Pigfoot Mountains and Central Pork.

Ver. 2.12.2 - February 9, 2017

 * Redesigned home screen.
 * Overhaul to daily quest layout and rewards.
 * All treasures are better now.
 * New hats  - Valentines, Wizard and Steampunk.
 * New 'Epic' card tier.
 * New slingshot tiers.
 * 80 new levels - Hamsterdam and Mississpiggy River.

Ver. 2.13.0 - April 11, 2017

 * Silver and the Blizzard Spell now deal more damage.
 * All chests grant better rewards.
 * The bonus system - Collect bonus points and claim rewards.
 * New hats - Easter, Work and Mythic.
 * New 'Epic' card.
 * New slingshot tiers.
 * 80 new levels - Boarneo and Got Ham City.

Ver. 2.14.0 - June 8, 2017

 * Introduced Feats.
 * New hats - Fruitshades, Sports and Pharoah.
 * New 'Ancient' card tier.
 * New slingshot tiers.
 * 80 new levels - Twin Beaks and Hog Warts.

Ver. 2.15.0 - August 3, 2017

 * Angry Birds 2 2nd Birthday event
 * Introduced clans.
 * New hats - Birthday, Chef and Ice Cream.
 * New 'Ancient' card tiers.
 * New slingshot tiers.
 * 80 new levels - Piggymanjaro and Porkyo.
 * Bug fixes.

Ver. 2.15.1 - August 9, 2017

 * Bug fixes.

Ver. 2.16.1 - October 12, 2017

 * Introduced clan battles.
 * New hats - Jester and Spooky.
 * Halloween sales.
 * 40 new levels.
 * New card tiers.

Ver. 2.17.0 - December 6, 2017

 * Introduced Mighty Eagle's Bootcamp.
 * New hat - Viking
 * 80 new levels - Porka Pica and United Steaks of Hamerica.

Ver. 2.17.1 - December 11, 2017

 * Bug fixes (assumed).

Ver. 2.17.2 - December 20, 2017

 * Bug fixes.

Ver. 2.17.3 ~ February 2018

 * New hat - NFL LII

Ver. 2.18.0 ~ March 2018

 * Introduced the Mighty Eagle's shop.
 * Rainbow feathers - can be given to any bird.
 * New hats - Stone Age and Samurai.
 * 40 new levels - Oinktario and Hamtarctica.
 * Valentine's day offers

Ver. 2.18.1 ~ March 2018

 * Legendary league in the Arena

Ver. 2.19.0 ~ April 2018

 * Clan chests.
 * Feather Frenzy event, double feathers for a limited time.
 * 80 new levels.
 * New slingshot tiers.

Ver. 2.19.1 ~ April 2018

 * Bug Fixes (assumed).

Ver. 2.20.0 ~ May 2018

 * Introduces Hatchlings
 * Jackpot egg on Tower of Fortune
 * 80 new levels
 * 2 new hat sets

Ver. 2.21.0 ~ July 2018

 * Introduces Piggy Mail
 * 80 new levels (2 areas, 40 lvl)
 * New hat set
 * Black Pearl event, double black pearls for a limited time