Survo puzzles: www.survo.fi/puzzles
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Copyright (c) Survo Systems 2006-2011

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 puzzle 252/2011 (190) #443-60426

   A  B  C  D
1  3  *  *  * 36
2  *  *  *  * 43
3  *  *  *  * 22
4  *  *  * 14 35
  13 24 43 56

Survo puzzle 253/2011 (1050) #443-98450

   A  B  C  D
1  *  *  *  * 13
2  *  *  *  * 56
3  *  *  *  * 43
4  *  *  *  * 24
  30 24 45 37

Survo puzzle 254/2011 (1350) #443-55526

   A  B  C  D
1  *  *  *  * 44
2  *  *  *  * 32
3  *  *  *  * 38
4  *  *  *  * 22
  22 54 14 46