Natural petroleum reservoir.
The first hint to crack the puzzle «Natural petroleum reservoir.» is:
It is a word which contains 9 letters
The second hint to crack the puzzle «Natural petroleum reservoir.» is:
It starts with letter O
O
The third hint to crack the puzzle «Natural petroleum reservoir.» is:
It ends with letter D
O
d
Looking for extra hints for the puzzle «Natural petroleum reservoir.»:
Click on any empty tile to reveal a letter
O
d
The answer for the puzzle «Natural petroleum reservoir.» is:
O
i
l
f
i
e
l
d