When Pigs Fly was released in July 2016 and was in fact a copy of another popular NetEnt slot game, Reel Rush (which is still available for play).
The game came with normal symbols on all reels and wild symbols on reels 2, 3, 4 and 5 only.
You would start out with 135 ways. And each time you got a winning combination during the same spin you would receive a new re-spin and more ways would open up. Until you opened up the maximum of 3125 ways.
Once all 3125 ways where open (after 6 winning spins during the same bet) you would start the free spins feature. You would be awarded with 8 free spins and all free spins where played with 3125 ways. You couldn’t win more free spins during this feature.
It was a very unique way of playing when it was first introduced by Reel Rush. Nowadays it’s not that unique anymore.
When Pigs Fly used a funny, cartoon-like, theme with pigs in space.
The game already got discontinued in 2017, which was pretty fast after the release.
I think it was because of a lack of interest and the fact that the same game already existed (Reel Rush). And for me, Reel Ruch has a much more appealing look.