It's an Angry Birds Expansion Pack and only playable with Mattel Angry Birds board games.
You can continue the fun of building, launching and destroying with this Angry Birds Add-On pack! It comes with three figures and six special power cards to add new specific functions for each bird, increase difficulty and enhance gameplay.
This set includes these figures: Green Bird, Blue Bird, and Construction Hat Pig.
The Angry Birds game will be set up as usual, except that the new power cards are shuffled in a different pile.
Every player draws a power card at the start of the turn. Every power card is different. Some of them adds a bonus pig to the castle, some other just swaps the first bird to a new one, but even special attacks can be executed.
With Green bird you can shoot again from the place it landed, with Blue bird you can shoot 3 times, etc.