Survo puzzles: www.survo.fi/puzzles
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Copyright (c) Survo Systems 2006-2014

The easiest way to solve these three problems may be
using a Java Applet
http://www.survo.fi/swap/puzzles.html
based on the swapping method.

Survo-ristikko 336/2014 (470) #443-58901

   A  B  C  D
1  *  *  5  * 28
2  *  *  *  * 42
3  *  *  *  * 36
4  *  *  *  * 30
  42 58 24 12

Survo-ristikko 337/2014 (650) #443-51154

   A  B  C  D
1  *  *  *  * 55
2  3  *  *  * 23
3  *  *  *  * 43
4  *  *  *  * 15
  22 47 30 37

Survo-ristikko 338/2014 (670) #443-33124

   A  B  C  D
1  *  *  *  * 56
2  *  *  *  * 27
3  *  *  *  * 42
4  *  *  *  * 11
  25 45 30 36