All paths through a 1x1 labyrinth visiting all cells.

+  +
|**|
+--+

All paths through a 2x2 labyrinth visiting all cells.

+  +--+
|  |**|
+  +  +
|     |
+--+--+

All paths through a 3x3 labyrinth visiting all cells.

+  +--+--+
|  |     |
+  +  +  +
|     |  |
+--+--+  +
|**      |
+--+--+--+

+  +--+--+
|  |   **|
+  +  +--+
|  |     |
+  +--+  +
|        |
+--+--+--+

+  +--+--+
|  |     |
+  +  +  +
|  |**|  |
+  +--+  +
|        |
+--+--+--+

+  +--+--+
|  |     |
+  +  +  +
|  |  |  |
+  +  +  +
|     |**|
+--+--+--+

All paths through a 4x4 labyrinth visiting all cells.

+  +--+--+--+
|  |**      |
+  +--+--+  +
|        |  |
+--+--+  +  +
|        |  |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |**      |
+  +--+--+  +
|     |     |
+--+  +  +--+
|     |     |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|     |**|  |
+--+--+  +  +
|        |  |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|     |     |
+--+--+  +--+
|   **|     |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|     |     |
+--+--+  +--+
|     |     |
+  +  +--+  +
|**|        |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|     |     |
+--+--+  +--+
|        |**|
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |     |**|
+  +  +  +  +
|     |  |  |
+--+--+  +  +
|        |  |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |     |  |
+  +--+  +  +
|        |  |
+--+--+--+  +
|**         |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |  |     |
+  +  +  +--+
|     |     |
+--+--+--+  +
|**         |
+--+--+--+--+

+  +--+--+--+
|  |**      |
+  +--+--+  +
|  |        |
+  +  +--+--+
|  |        |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |  |**   |
+  +  +--+--+
|  |        |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |     |**|
+  +  +  +  +
|  |  |     |
+  +  +--+--+
|  |        |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |  |     |
+  +  +  +--+
|  |**|     |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |      **|
+  +  +--+--+
|  |  |     |
+  +  +  +  +
|  |     |  |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |**|     |
+  +  +  +  +
|  |  |  |  |
+  +  +  +  +
|  |     |  |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |     |  |
+  +--+  +  +
|  |**   |  |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |  |**|  |
+  +  +  +  +
|  |     |  |
+  +--+--+  +
|           |
+--+--+--+--+

+  +--+--+--+
|  |      **|
+  +  +--+--+
|  |        |
+  +--+--+  +
|  |     |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+  +--+--+--+
|  |**|     |
+  +  +  +  +
|  |     |  |
+  +--+--+  +
|  |     |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |   **|  |
+  +--+--+  +
|  |     |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |     |  |
+  +--+  +  +
|  |     |  |
+  +  +--+  +
|     |**   |
+--+--+--+--+

+  +--+--+--+
|  |**      |
+  +--+--+  +
|  |     |  |
+  +  +  +  +
|  |  |  |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |  |**|  |
+  +  +  +  +
|  |  |  |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |  |     |
+  +  +  +--+
|  |  |     |
+  +  +--+  +
|     |**   |
+--+--+--+--+

+  +--+--+--+
|  |        |
+  +  +--+  +
|  |  |     |
+  +  +  +--+
|  |  |  |**|
+  +  +  +  +
|     |     |
+--+--+--+--+

+  +--+--+--+
|  |     |**|
+  +  +  +  +
|  |  |  |  |
+  +  +  +  +
|  |  |  |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+--+  +--+--+
|**|        |
+  +--+--+  +
|        |  |
+--+--+  +  +
|        |  |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|**|        |
+  +--+--+  +
|  |     |  |
+  +  +  +  +
|  |  |  |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+--+  +--+--+
|**|        |
+  +--+--+  +
|     |     |
+--+  +  +--+
|     |     |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|**|        |
+  +--+--+  +
|  |        |
+  +  +--+--+
|  |        |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|**|  |     |
+  +  +  +  +
|  |     |  |
+  +--+--+  +
|  |     |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+--+  +--+--+
|**|  |     |
+  +  +  +  +
|  |  |  |  |
+  +  +  +  +
|  |     |  |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |**   |
+  +--+--+  +
|        |  |
+--+--+  +  +
|        |  |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|        |  |
+--+--+--+  +
|      **|  |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|        |  |
+--+--+--+  +
|**|     |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|        |  |
+--+--+--+  +
|        |  |
+  +--+  +  +
|   **|     |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|        |  |
+--+--+--+  +
|           |
+  +--+--+--+
|         **|
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|     |  |  |
+--+  +  +  +
|**|     |  |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |**   |
+  +--+--+  +
|     |     |
+--+  +  +--+
|     |     |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|     |  |**|
+--+  +  +--+
|     |     |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|     |  |  |
+--+  +  +  +
|     |**|  |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|     |  |  |
+--+  +  +  +
|     |  |  |
+  +--+  +  +
|        |**|
+--+--+--+--+

+--+  +--+--+
|     |**   |
+  +--+--+  +
|  |        |
+  +  +--+--+
|  |        |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|  |     |**|
+  +  +--+--+
|  |        |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|  |**|  |  |
+  +  +  +  +
|  |     |  |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|  |     |  |
+  +  +--+  +
|  |   **|  |
+  +--+--+  +
|           |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|  |     |  |
+  +  +--+  +
|  |     |  |
+  +--+  +  +
|        |**|
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|  |**   |  |
+  +--+--+  +
|  |     |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+--+  +--+--+
|     |**   |
+  +--+--+  +
|  |     |  |
+  +  +  +  +
|  |  |  |  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|  |     |  |
+  +  +--+  +
|  |  |**|  |
+  +  +  +  +
|     |     |
+--+--+--+--+

+--+  +--+--+
|     |     |
+  +--+  +  +
|  |     |  |
+  +  +--+  +
|  |  |     |
+  +  +  +--+
|     |   **|
+--+--+--+--+