PlaySudoku.us
Hard · Puzzle #512
2
8
5
4
9
4
2
1
6
9
2
7
5
6
1
3
2
5
5
6
9
4
1
8
5
7
"He who learns but does not think is lost. He who thinks but does not learn is in great danger." — Confucius
"He who learns but does not think is lost. He who thinks but does not learn is in great danger." — Confucius
"A mathematician is a device for turning coffee into theorems." — Paul Erdős
"A mathematician is a device for turning coffee into theorems." — Paul Erdős