Chicken Invaders: Revenge of the Yolk (or Chicken Invaders 3) comprises the main game together with Easter and Christmas editions. It is similar to the second version (with up to 4 player cooperative play). It has 120 waves, in 10 levels across 12 systems in the galaxy. There are 30 bonuses. Weapons have 11 power levels, and a secret 12th level, which can only be reached by acquiring an additional 10 powerups after the 10th level powerup (the 20th). There are also eight unlockables which are unlocked after repeatedly completing the entire game. The game also comes in a Christmas Edition and an Easter Edition. https://en.wikipedia.org/wiki/Chicken_Invaders