Sudoku by
krazydad
🍪
Sudoku, Super-tough, 3-1-1
©2026 krazydad.com
1
2
3
4
5
6
7
8
9
X
1
2
3
4
5
6
7
8
9
X
1
2
3
4
5
6
7
8
9
×
1
2
3
4
5
6
7
8
9
H
int
Check
A
nswer
Reveal
E
rrors
Clear Puzzle
I
nstructions
Set up Marks
Clear Marks
P
ause/unpause
×
Close
Puzzle Calc
0
1
2
3
C
4
5
6
+
7
8
9
-
0
=
×
Close
Sudoku Settings
Block coloring
Double-tap selects block
Mark with dots
Auto-clear marks
Auto-set marks
Auto-check answers
Reveal solved digits
Off
On
Auto
Dark Mode
Pics
Quotes
Both
Rewards
×
Close
Find a puzzle
Variety
Easy
Novice
Intermediate
Challenging
Tough
Super-tough
Insane
Volume#
Book#
Puzzle#