How To Solve Domino Puzzles
Here is a typical Domino puzzle grid. The grid size can be smaller or larger and varies in difficulty.
This puzzle requires that you find the dominos from 0-0 to 5-5 (notice that the largest number in the grid is 5). The dominos can be laid out vertically or horizontally.
The solution to the puzzle is shown here. Notice that each domino piece is outlined with a rectangle. Each piece contains only two numbers, and there are no overlapping pieces. All the dominos from 0-0 to 5-5 are present (0-0, 0-1, 0-2, etc.).
Some Common Strategies
Look for dominos that can only be placed in one place in the grid. For example, in the sample puzzle above, notice only one area contains 0-0 (5th row), so this must be that domino. Contrast this to the two 4-4 combinations in rows one and three. In this case, we do not yet know which is correct.
Check the digits in the four corners. When the two adjacent digits (beside and above/below) are the same, you know that must be the domino for those two numbers. For example, there is a 2 in the top right corner of the sample puzzle with a 0 to the left and below it. The 0-2 domino must be in that corner and cannot exist in any other place in the puzzle, such as in column six or row five.