Pogo is offering 25% Off Undiscovered World Episodes. No promo code required, the prices have already been marked down in game (15 gems for Club Members and 23 gems for non-Club members).
Excludes Chapter 12 "The Unknown Men" episode.
http://www.pogo.com/games/undiscovered-world
(https://i.imgur.com/iCjpLAt.png)