This discount includes following Linux titles:

• Chicken Invaders: Revenge of the Yolk
  Dash across the galaxy in a race against time to rescue Earth from the latest and greatest chicken threat!
  
• Chicken Invaders: Revenge of the Yolk (Christmas Edition)
  Dash across the galaxy to save our Christmas roast in this festive edition of Chicken Invaders: Revenge of the Yolk!
• Chicken Invaders: Revenge of the Yolk (Easter Edition)
  Dash across the galaxy... well, you get the picture. This time, you're up against the Easter bunny and his army of hatchlings!
  
• Chicken Invaders: The Next Wave
  The chickens have returned and it's up to you to save the world again!
  
• Chicken Invaders: The Next Wave (Christmas Edition)
  Forget all about Christmas Turkey and step up to Christmas Chicken in this festive edition of Chicken Invaders: The Next Wave!