Story 3: Las Plagas is a stage in the "Story Mode" of Resident Evil 4: Mobile Edition, the iOS and Android adaptation of Resident Evil 4. Counting the tutorial, Story 0: Basic Training, it is the fourth level in the game.
"Leon's body starts to writhe in pain as the Plaga parasite begins to grow."
— Official description
This level introduces the threat of Plaga A. The Anonymous Letter is found at the start of the level. On the bridge, the Mask with Divots can be shot down. In a crate nearby is the notice to the villagers and "Closure of the Church".
Completing Las Plagas unlocks Story 4: The Giant's Den as well as Mercenary 4: Pincer Attack.