Difficult

On Math is Fun, this morning, and solved a 'Hard' Sudoku:

                                             

                                              

Thse are well designed. Harder means having to check he line, the column, the subgrid

and whether oulying free spaces might or not eventually eliminate a number possibility...

Rod Pierce, the founder of Math is Fun, holds a Diploma in Civil Engineering and a

Bachelor in Engineering!

                                                                *     *     *

Worked on a 'Tough' one to the point of exhaustion. Some of the digits were

all out early on, but I had to content with a lot either/or options with no clues.

Finally gave in and would randomly put one in and push the 'check' button. Pas

joli, I'll try another tomorrow to see if this really is the level...