Grandpa Smurf was introduced to the smurfs village in Thanksgiving 2012 update where he was featured as the main character. He is only available in the mountains and can be found at level 25. After a series of quests from Papa Smurf to make a hot air balloon and fly to the mountains. He is not stationary and works similar to Papa Smurf on the mainland, that is he gives out quests and walks around the mountain village. Whenever he has quest for you, a yellow exclamation mark will pop up over his head, if you tap him, he will tell you what to do in the mountains. His quests are similar to papa Smurfs ones so whenever you complete them you earn XP.
Grandpa Smurfs Hut is also available in the mountains to build. It costs 30 Smurfberries and gives XP rewards for all the gems that have been placed in the mountains. The gems are available as rewards from digging in the mountains, for more information please read the article about the mountains article.