To understand the demand, we need to rewind to 2011. When the first generation iPad launched, Rovio realized that scaling up a phone game to a tablet resulted in blurry, pixelated birds. So, they developed Angry Birds HD (sometimes labeled Angry Birds Original HD or Angry Birds Classic HD ).
If you owned a high-end tablet or an early "phablet" like the Samsung Galaxy Note between 2011 and 2014, you remember the dream: playing Angry Birds on a large screen without pixelation. Here is the story of that port, why it mattered, and how to experience it today. angry birds hd android port
For purists, the HD port represents the peak of the classic era before the games were delisted or rebranded as Rovio Classics Blog Post: Revisiting the Slingshot – The Curious