Angry Birds Seasons: Go Green, Get Lucky is an iPad/iPhone/iTouch/Android puzzle game.  This page describes how to beat levels 1-16 to 1-18.

1. Send the yellow bird straight ahead into the structure.  Try and aim for the middle of the wall of the structure at the pig closest to where the birds take off.  You should destroy that pig and cause the structure to collapse which should destroy the next two pigs to the right (a large one and a small one).  There should be two pigs left located above the pot of gold.
2. Send the next yellow bird into the pot of gold which should cause the wooden structure that it is in to collapse and destroy the two remaining pigs.
3. You will have two red birds left over.

1. Send the white bird up so it falls between the large tree and the wooden structure located on the platform (to the right of the screen).  Release the egg right before the bird hits the mini tree to send the body of the bird into the wodden structure causing it to collapse.  The pig above the pot of gold should fall and be destroyed and the pig on the right-hand side of the tree should also be destroyed as well as the small pigs on top of the wooden structure.
2. Send the yellow bird into the bast of the large tree (closest to where the birds take off) which will cause the tree to collapse and destroy the remaining pigs within it.
3. Aim the red bird at the large remaining pig with the hat (on the platform in the bottom of the wooden structure).  This should cause the structure to fall and the remaining pigs to be destroyed.
4. You should have on red bird left over.

1. Send the yellow bird up so it comes down and breaks through the wooden structure to the left of the wooden "x" and below it.  This should cause the structure to collapse slightly but not destroy any pigs.
   
2. Send the white bird straight into the structure and release the egg right before the bird hits the structure to cause damage with the body of the bird and the egg.  This should destroy a pig or two.
3. Send the green bird over the structure and send it back into the structure so that it crashes into the bottom level of it, causing the structure to collapse and fall to the left. This should destroy the remaining pigs at the bottom of the structure.
4. There should be one large pig left.  Aim the yellow bird directly at this pig which should destroy it.
5. You should have on white bird left over.