Pig Fortress

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.

Terrains

 * 1) Plains (Worlds 1 and 4)1-1.png and ice.]]
 * 2) Deserts (World 5)
 * 3) Mountains (World 2)
 * 4) Sunset Mountain (World 3)
 * 5) Jungle (World 6)
 * 6) City (Worlds 7 and 11)
 * 7) Clouds (World 8)
 * 8) Construction (Worlds 9-11 [based on themes from previous levels])
 * 9) Western (Worlds 12-14)
 * 10) Cave (Worlds 15-17)
 * 11) Cake land (World 18-19)
 * 12) Summer Mountains (World 20)
 * 13) Autumn (World 21)
 * 14) Night time (World 22
 * 15) Beach (Surf And Turf Levels 1 to 15)