If you are still stuck, jump back to Hard Expert Full Answer.

Hard Expert Level 1
F
H
S
V

Hard Expert Level 2
C
D
T
H
O

Hard Expert Level 3
M
S
P
P

Hard Expert Level 4
H
G
P
T
S

Hard Expert Level 5
C
F
L
B

Hard Expert Level 6
W
S
S
S
S

Hard Expert Level 7
S
R
S
O
V

Hard Expert Level 8
S
P
D
I

Hard Expert Level 9
P
D
C
O

Hard Expert Level 10
M
D
B
V

Hard Expert Level 11
R
S
U
W

Hard Expert Level 12
C
C
L
R

Hard Expert Level 13
M
V
C
H

Hard Expert Level 14
P
V
G
E

Hard Expert Level 15
P
G
O
C

Hard Expert Level 16
I
B
T
K
C

Hard Expert Level 17
P
C
T
T

Hard Expert Level 18
S
P
G
S

Hard Expert Level 19
P
Z
P
C
S

Hard Expert Level 20
B
S
R
M