Variations on Junior Sudoku Logic Puzzles (Vol 1) 
 Chapter 16: Twenty-Four Difficult Sudoku-5-Spot Puzzles (numbers 265-288) 
 
-  Step-by-step instructions for solving  Puzzle 265, (20/25)   Diff: 7/321.3452
 -  Step-by-step instructions for solving  Puzzle 266, (20/25)   Diff: 7/135.3431
 -  Step-by-step instructions for solving  Puzzle 267, (20/25)   Diff: 7/124.2443
 -  Step-by-step instructions for solving  Puzzle 268, (21/25)   Diff: 7/342.2361
 -  Step-by-step instructions for solving  Puzzle 269, (21/25)   Diff: 7/244.3233
 -  Step-by-step instructions for solving  Puzzle 270, (21/25)   Diff: 7/232.2444
 -  Step-by-step instructions for solving  Puzzle 271, (21/25)   Diff: 7/232.2444
 -  Step-by-step instructions for solving  Puzzle 272, (21/25)   Diff: 7/135.3432
 -  Step-by-step instructions for solving  Puzzle 273, (21/25)   Diff: 7/134.3442
 -  Step-by-step instructions for solving  Puzzle 274, (21/25)   Diff: 7/122.3355
 -  Step-by-step instructions for solving  Puzzle 275, (21/25)   Diff: 7/112.3473
 -  Step-by-step instructions for solving  Puzzle 276, (19/25)   Diff: 8/4211.1541
 -  Step-by-step instructions for solving  Puzzle 277, (20/25)   Diff: 8/3311.4431
 -  Step-by-step instructions for solving  Puzzle 278, (20/25)   Diff: 8/2212.4441
 -  Step-by-step instructions for solving  Puzzle 279, (20/25)   Diff: 8/2211.1355
 -  Step-by-step instructions for solving  Puzzle 280, (20/25)   Diff: 8/1312.2632
 -  Step-by-step instructions for solving  Puzzle 281, (21/25)   Diff: 8/4112.2362
 -  Step-by-step instructions for solving  Puzzle 282, (21/25)   Diff: 8/3322.2243
 -  Step-by-step instructions for solving  Puzzle 283, (21/25)   Diff: 8/2241.1443
 -  Step-by-step instructions for solving  Puzzle 284, (21/25)   Diff: 8/2221.3452
 -  Step-by-step instructions for solving  Puzzle 285, (21/25)   Diff: 8/2221.3452
 -  Step-by-step instructions for solving  Puzzle 286, (21/25)   Diff: 8/1322.2632
 -  Step-by-step instructions for solving  Puzzle 287, (21/25)   Diff: 8/1322.2632
 -  Step-by-step instructions for solving  Puzzle 288, (21/25)   Diff: 8/1221.2364