A Pig fortress is what the Bad Piggies build to protect themselves against and slow down the Birds from retaking their Eggs. Pig Fortresses can be in any terrain: Mines, Jungles, Clouds, Normal Terrain, Construction sites, Desert etc. Most of them are buildings, but some are seen to be methods of transport, for example, a tank-shaped structure in one level and wooden cars in a Golden Egg level. They mainly include materials such as ice, stone, and wood. They eventually get stronger in the later levels.
Terrains
- Plains (Worlds 1 and 4)
- Deserts (World 3 and 5)
- Bamboo Gardens (World 2)
- Jungle (World 6)
- City (Worlds 7 and 11)
- Clouds (World 8)
- Construction (Worlds 9-11 [based on themes from previous levels])
- Western (Worlds 12-14)
- Cave (Worlds 15-17)
- Cake land (World 18-19)
- Bad Piggies Theme 1: Ground Hog Day (World 20)
- Bad Piggies Theme 2: When Pigs Fly (World 21)
- Bad Piggies Theme 3: Unknown (World 22)
- Beach (Surf And Turf Levels 1 to 15)
- River (Surf and Turf Levels 16 to 30)
- Stormy Mountainside (Surf and Turf Levels 31 to 45)