A sudoku puzzle......and its solution numbers marked in redThe top right region must contain a 5. By hatching across and up from 5s elsewhere, the solver can eliminate all the empty cells in the region which cannot contain a 5. This leaves only one possibility (shaded green).A method for marking likely numerals in a single cell by the placing of pencil dots. To reduce the number of dots used in each cell, the marking would only be done after as many numbers as possible have been added to the puzzle by scanning. Dots are erased as their corresponding numerals are eliminated as candidates.
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Ravensburger Oceanic Wonders - 3000 Piece Puzzle $19.99 Melissa & Doug See & Spell $10.10
Melissa & Doug Deluxe 10-Piece Magnetic Fishin $5.98 Melissa & Doug Deluxe Wire Puzzle Rack $11.66
Melissa & Doug Deluxe Classic Peg Puzzle (Pack $17.05 Melissa & Doug Wooden Bear Family Dress-Up Puz $8.39
Melissa & Doug Beginner Pattern Blocks $9.99 Melissa & Doug USA Map 51 pcs Floor Puzzle $6.05
Ravensburger Stow & Go - Puzzle Accessories $13.99 Buffalo Games Puzzle Presto Peel & Stick Puzzl $4.99
White Mountain Puzzles Tapestry Cat $10.25 Melissa & Doug See-Inside Numbers Peg $3.87
Melissa & Doug On the Farm Jigsaw (12 pc) $3.68 Melissa & Doug See-Inside Alphabet Peg Puzzle $4.78
Ravensburger Venetian Expressions - 1000 Piece Puz $11.34 Melissa & Doug Dinosaurs 48 pcs Floor Puzzle $9.80
Rummikub Large Number Edition $15.98 Melissa & Doug Dinosaurs Extra Large Floor Puz $5.71
Melissa and Doug Farm Friends 32 pc Floor Puzzle $9.98 Melissa & Doug Alphabet Train Floor Puzzle $6.99
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Prices current as of last update, 01/23/12 12:05pm.

Price is accurate as of the date/time indicated. Prices and product availability are subject to change. Any price displayed on the Amazon web site at the time of purchase will govern the sale of this product

See also...
Modern (1970-Now), Puzzles
Vintage (Pre-1970), Puzzles

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