Upgrades

Upgrades is a single powerup that can be used to power up the ability of a bird or pig currently on the slingshot. Upgrades are:
 * 1) Red Bird > Shaker Bird: shakes the fortress with its scream. When it screams, it breaks all glass
 * 2) Blue Bird > Five-splitter Bird: splits into five slightly smaller but powerful birds that can break wood
 * 3) Yellow Bird > Light Bird: speeds up incredibly faster, doesn't lose its speed when activated. Can break ice
 * 4) Black Bird > TNT Bird: a bit lighter, and explodes directly on impact and when activated
 * 5) White Bird > Three Egg Bird: can activate ability three times until flattened or already became corpse
 * 6) Boomerang Bird > Back Bird: when activated, goes back and shakes the fortress at the same time.
 * 7) Big Brother Bird > Big Shaker Bird: more shaking, and its moan breaks wood
 * 8) Orange Bird > Balloon Bird: when deflating, blows away everything nearby.
 * 9) Ice Bird > Blizzard Bird: a bigger explosion and bigger freezing radius.
 * 10) Pink Bird > Bubblewand Bird: slightly bigger, and blows 10 more bubbles and can repeat the bubble blowing 10 times
 * 11) Silver Bird > Vortex Bird: Loops so many times that it sucks up pigs and blocks, slamming them to the ground.

Gallery
Comin' soon!!