Domino Puzzles
One of the best known types of puzzles uses the double-6 set. In the grids below the dominoes have been arranged in a 4 x 7 grid. This gives a grid of 8 x 7 numbers. You miss one piece of information: the borders between the dominoes. Your task is to draw these lines.
1.| 2 | 5 | 1 | 1 | 5 | 5 | 4 |
|---|---|---|---|---|---|---|
| 3 | 2 | 4 | 0 | 5 | 5 | 4 |
| 3 | 3 | 6 | 2 | 2 | 1 | 4 |
| 1 | 0 | 1 | 5 | 0 | 3 | 0 |
| 6 | 4 | 3 | 6 | 5 | 2 | 2 |
| 6 | 6 | 3 | 6 | 4 | 0 | 2 |
| 0 | 1 | 0 | 3 | 4 | 0 | 6 |
| 4 | 1 | 1 | 2 | 5 | 3 | 6 |
From 'Games & Puzzles' 12, April 1973.
2.| 2 | 0 | 4 | 4 | 4 | 0 | 6 |
|---|---|---|---|---|---|---|
| 2 | 6 | 5 | 0 | 5 | 2 | 6 |
| 4 | 4 | 3 | 3 | 1 | 0 | 0 |
| 1 | 5 | 2 | 4 | 0 | 6 | 3 |
| 6 | 5 | 5 | 3 | 1 | 5 | 1 |
| 4 | 2 | 3 | 6 | 4 | 3 | 1 |
| 1 | 0 | 2 | 5 | 5 | 2 | 6 |
| 2 | 0 | 1 | 6 | 1 | 3 | 3 |
From 'Games & Puzzles' 68.
Here are some with irregular grids. (Thanks to Teun Spaans)
3.| 4 | 2 | 5 | 6 | |||||
|---|---|---|---|---|---|---|---|---|
| 4 | 3 | 3 | 2 | |||||
| 3 | 4 | 2 | 3 | |||||
| 1 | 1 | 2 | 3 | |||||
| 0 | 6 | 0 | 1 | |||||
| 5 | 2 | 1 | 1 | 5 | 3 | 2 | 3 | 1 |
| 6 | 1 | 2 | 4 | 1 | 5 | 1 | 0 | 0 |
| 1 | 5 | 4 | 0 | 6 | 6 | 6 | 2 | 3 |
| 5 | 5 | 0 | 0 | 4 | 6 | 0 | 5 | 6 |
| 0 | 4 | 4 | 1 | 1 | 1 | 2 | 0 | 0 |
|---|---|---|---|---|---|---|---|---|
| 4 | 1 | 2 | 2 | 2 | 4 | 2 | 6 | 3 |
| 4 | 0 | 3 | 5 | |||||
| 3 | 5 | 3 | 3 | |||||
| 2 | 1 | 3 | 6 | |||||
| 2 | 3 | 6 | 2 | |||||
| 5 | 5 | 6 | 0 | |||||
| 0 | 4 | 0 | 0 | 6 | 4 | 6 | 5 | 1 |
| 6 | 1 | 6 | 5 | 5 | 5 | 1 | 4 | 3 |
| 3 | 4 | 3 | 1 | 6 | 6 | 5 | 4 |
|---|---|---|---|---|---|---|---|
| 3 | 6 | 1 | 3 | 3 | 2 | 1 | 4 |
| 1 | 4 | 0 | 0 | 5 | 0 | ||
| 2 | 0 | 6 | 0 | 1 | 4 | ||
| 6 | 1 | 0 | 1 | 1 | 5 | ||
| 6 | 2 | 5 | 4 | 0 | 2 | ||
| 5 | 6 | 3 | 6 | 4 | 2 | 2 | 3 |
| 5 | 0 | 3 | 5 | 4 | 2 | 2 | 5 |