Coin

Coins (also known as Bird Coins) are the main game currency that appears in almost every games of the Angry Birds series. They were first introduced in Angry Birds Friends, and then coins were featured in other games by later updates. For Bird Coins, they appear as small gold coins with Red's face on them. Some coins have different appearence in other games.

Angry Birds Friends
When you start the game for the first time after the release of the Bird Coins, you get a text box telling you about them, and you can also get  × 440, but only once. You can earn more for free by earning stars in Weekly Tournaments, and completing them. When you complete a Tournament Level, you will get +  × 2 for, + × 4 for , and +  × 8 for , if you get all the stars in a level, you will get +  × 14. You can also get from daily rewards. You will get + × 4 in the first day, +  × 6 in the second day in a row, +  × 10 in the third day in a row, +  × 16 in the fourth day in a row, and +  × 50 in the fifth day in a row. However, streak will be restart every five days if you login every day.

Angry Birds Star Wars 2
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In this game, you can use coins to unlock characters, powerups, etc. to use in levels.

Angry Birds Go!
In Angry Birds Go!, Bird Coins appear in every track and can be collected to increase the amount of awarded coins when finishing a race.

In v1.0, they are mainly used to purchase upgrades for the player's karts, but once the player unlocks Rocky Road, they can also be used to purchase new karts as well.

In v2.0, they are mainly used to purchase upgrades for the player's karts with upgrade parts, and it's also used for purchase 3 upgrade parts at the shop (100 coins for regular parts, 1,000 coins for Rare parts, and 10,000 for Epic parts). There's a big coins appear in every track as well, for 50 coins.

Angry Birds Epic
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Coins Are used to buy stuff at shop and buy potions and/or other items.

Angry Birds Stella
In Angry Birds Stella, the pigs can drop coins on the levels, you can get coins by earning the stars and roulette wheel after you pass the Bonus Levels.

They're mainly used to spend on the characters, and the Hammer power-up. You can also spend coins on investigate area to find the pigs on the map.

Angry Birds Transformers
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Angry Birds POP!
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Angry Birds Fight!
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Angry Birds Rio
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Coins are used to buy power ups and rio2 chapter 5

Bad Piggies
In Bad Piggies, the player earn coins by completing a level, get the Star Boxes (only in Sandbox), and feed the King Pig. The players can get coins by earning stars. Player get 1 coin for 1 star, 2 for 2 stars, and 3 for 3 stars.

Angry Birds Seasons
Coins were added on the Invasion of the Egg Snatchers update along with Bird Wear and Telebird. They are obtained after beating a level, watching ads or by purchasing it. They can be used to speed a Quest's time, buy episodes before Ham Dunk, Power-Ups or level-up Telebird or Shockwave Bomb, Star or Feather levels and could buy exclusive Bird Wear, but they were later made free.

Angry Birds
Bird Coins used to only appear in Angry Birds for Kakao. They used to purchase Power-Ups and Mighty Eagle. You can earn them by getting stars just for 10 coins. Coins were eventually added to every other region of Angry Birds. They are only used to buy power-ups. They can be purchased with Gems.

Angry Birds Action!
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Angry Birds Ace Fighter
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Angry Birds Goal!
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Angry Birds Holiday
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Angry Birds Blast!
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