PB Post 2013 03 29 Lvl 5 (Repeated lower down)
For learning purposes, this author exhausts use of single and double-line line eliminations before examining pairs and doubles. The gray boxes reflect this order. This is NOT a recommendation, and other users might easily find answers NOT in the boxes.
PB Post 2013 03 29 Lvl 5 Same as above, except the gray boxes are filled in.
For learning purposes, the author waited to apply pairs and doubles. To proceed with the puzzle above, note in GROUP 6, there are two pairs of 6/8. This allows elimination of 6 and 8 from other boxes in Group 6.
PB Post 2013 04 05 Lvl 5 (Repeated lower down)
Gray boxes above are pretty easy. User may find other answers, but a good lesson will follow if the gray boxes are done first.
PB Post 2013 04 05 Lvl 5 w32 Same as above, except the gray boxes are filled in.
GOOD LESSON HERE:
Odds are that regular Level 5 users will not need hints, but nice to notice a TRIPLE in play here.
In Group3, notice the 3/8 pairs allow some eliminations.
Then (still in group 3) notice the two 5/7/9 triples and the 5/9 double. This is 3 boxes, 3 numbers. Those three numbers can be eliminated from OTHER boxes in the group. That leaves H3 with just a 4!
This author next noticed that H9 now contained the only 7 in the column.
Then, with 30 remaining, column H contained a 3/8 pair, which would prove that H6=9.
Easy finish from there.
??Messed up date
PB Post 2013 05 19 Lvl 5 Sunday (Repeated lower down)
For no good reason, I'm presenting hints of history of my order of solving this puzzle.
First, I found a naked 9.
Then I found Hidden 2, Hidden 6, two hidden 7s, hidden 9,
two hidden 4s, ALL of the 7s, hidden 5.
Then, in row 3, I used "single line eliminations" to cross out some 5s in group 3.
That left me with 38 unsolved boxes, as shown below. A good place to practice finding hidden pairs.
PB Post 2013 05 19 Sunday Lvl 5 w38 Same as above, except the pink boxes are filled in.
In row 3, the two underlined 5's can be crossed out by "single line elimination".
In any order...you can now locate:
in Row 3 and in Column G: 2/4 Hidden pairs. which allow some eliminations.
in Group 4, find the 5/6 hidden pair, and eliminate more things.
FINALLY, in Row 5, there is now a hidden 3.
After all that, the puzzle finishes with all naked singles.
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