Number Square 2
 Putting the numbers 0-15 into a 4x4 square adds up to a Challenger Logic Puzzle.
Index | Instructions | Printable | Solution
 June 14, 2004
 A Number Square is a 4x4 arrangement with a different number 0-15 in each cell. For example, a Number Square could be:     1 12  3  2     9  8 13  7     4 15  0 11    10 14  6  5 Given the clues below, can you determine the composition of Number Square 2? On the upper-left to lower-right diagonal, the upper left number minus the number next to it down the diagonal equals 14; the lower right number on the upper-left to lower-right diagonal minus the number next to it up the diagonal also equals 14. The entry in col. 2, row 3 minus the number in col. 1, row 3 equals 7. The number in col. 1, row 3 minus the value in col. 1 row 4 gives 1. The four numbers down the leftmost column of the square add to 34. The sum of the four numbers in row 3 of Number Square 2 equals 24. Adding the four bottom-row numbers equals 37. Subtracting the number in col. 2, row 4 from the number in col. 3, row 4 leaves 1. The number in col. 3, row 1 less the number in col. 4, row 1 equals 4. Taking the entry in col. 4, row 2 from the value in col. 2, row 1 gives 5.