Survo puzzles: www.survo.fi/puzzles --------------------------------------- Copyright (c) Survo Systems 2006-2009 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 177/2009 (60) #342-98466 A B C D 1 3 * * * 16 2 * * * * 22 3 * * * * 40 16 22 11 29 Survo puzzle 178/2009 (150) #343-90056 A B C D 1 * * * * 24 2 * * * * 17 3 * * * * 37 20 16 32 10 Survo puzzle 179/2009 (110) #343-10232 A B C D 1 * * * * 32 2 * * * * 21 3 * * * * 25 24 33 8 13