Fireflies are special items in Diamond Digger Saga, that appear only on firefly level. ( 
).
First appearance: Level 5 (Episode 1, Diamond Dale).
The objective of the firefly level is to wake up the required amount of fireflies. That amount does not have to be the exact number of all fireflies on the level. For example, level 48 requires you to wake up 8 fireflies to pass the level, while there's a total of 9 fireflies on the level.
Gallery[]
Sleeping firefly
Awakening firefly
Level 5 is the first firefly level
How firefly wake up (web)
Too many fireflies missed