Green Bird hint:
To more effectively use the green bird/boomerang bird, simply launch it backwards and tap before it goes off the screen so it can launch like any other bird.

Sound board:
To unlock the Sound Board, earn 3 stars on every level in worlds 1-3

Golden Eggs:
Find the following Golden Eggs by performing the corresponding tasks:

Golden Egg 01 – Get 3 stars in worlds 4-5
Golden Egg 02 – Tap the sun on the select screen
Golden Egg 03 – Tap the egg at the end of the credits
Golden Egg 04 – Go to the help screen and tap the egg at the end
Golden Egg 05 – In Level 1-8, tap the out of reach chest
Golden Egg 06 – In Level 2-2, bust the beach ball
Golden Egg 07 – In Level 4-7,tap the egg at the very top right of the map
Golden Egg 08 – In Level 5-19, on the top right of the left tower
Golden Egg 09 – In Level 6-14, bust the yellow balloon
Golden Egg 10 – In level 6-14 bust the yellow balloon in the lower right corner
Golden Egg 11 – In theme 8’s level page, brush the screen right to left to reveal a golden egg
Golden Egg 12 – Get 3 stars for every level in Danger Above
Golden Egg 13 – In level 8-15 break the boxes in the far left corner
Golden Egg 14 – In level 9-14 fire the boomerang bird at the hat on the far right side of the screen on the small cliff.
Golden Egg 15 – Bust the rubber duck in the bottom left side In 10-3
Golden Egg 16 – Get three stars on all levels in the Big Setup