0.5.
The first hint to crack the puzzle «0.5.» is:
It is a word which contains 4 letters
The second hint to crack the puzzle «0.5.» is:
It starts with letter H
H
The third hint to crack the puzzle «0.5.» is:
It ends with letter F
H
f
Looking for extra hints for the puzzle «0.5.»:
Click on any empty tile to reveal a letter
H
f
The answer for the puzzle «0.5.» is:
H
a
l
f