Survo puzzles: www.survo.fi/puzzles --------------------------------------- Copyright (c) Survo Systems 2006-2015 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 360/2015 (260) #443-20906 A B C D 1 * 6 * 2 32 2 * * * * 35 3 * * * * 43 4 * * * * 26 44 25 56 11 Survo puzzle 361/2015 (1000) #443-935 A B C D 1 * * * * 41 2 * * * * 47 3 * * * * 19 4 * * * * 29 17 24 55 40 Survo puzzle 362/2015 (1000) #443-37253 A B C D 1 * * * * 37 2 * * * * 24 3 * * * * 43 4 * * * * 32 43 11 26 56