The S in a book's ISBN.
The first hint to crack the puzzle «The S in a book's ISBN.» is:
It is a word which contains 8 letters
The second hint to crack the puzzle «The S in a book's ISBN.» is:
It starts with letter S
S
The third hint to crack the puzzle «The S in a book's ISBN.» is:
It ends with letter D
S
d
Looking for extra hints for the puzzle «The S in a book's ISBN.»:
Click on any empty tile to reveal a letter
S
d
The answer for the puzzle «The S in a book's ISBN.» is:
S
t
a
n
d
a
r
d