You can unlock all level without playing by follow this instruction
# After loading Angry Birds going to world screen.
# In center of attention a locked away world on the cover.
# Now push the button of back the whole way away of Angry Birds.
# Take few moment to load Angry Birds. Now tap “Play” button.
# You had better be at bottom the locked up worlds stage choose cover.
# So pass 1st level of all world to unlock them.
In 1-3 worlds get 3 stars in every level to unlock sound board.
Here are the locations of the Golden Eggs.
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