This is a maze generator
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|                          |           |        |           |
+  +--+  +--+--+--+--+--+  +  +--+--+  +  +--+  +  +--+  +  +
|  |     |              |     |        |     |        |  |  |
+--+  +--+--+--+  +--+  +--+--+  +--+--+--+  +--+--+--+  +  +
|     |           |        |           |     |  |        |  |
+  +--+  +--+--+--+--+--+--+  +--+--+--+  +--+  +  +--+--+  +
|  |     |                       |        |     |     |     |
+  +  +  +  +--+--+--+--+  +--+--+  +--+--+  +  +--+  +--+  +
|  |  |     |           |     |     |        |  |  |     |  |
+  +  +--+--+  +--+--+  +--+--+  +--+--+--+  +  +  +--+  +--+
|  |        |  |     |  |        |           |  |     |     |
+  +--+--+  +  +--+  +  +  +--+--+  +  +--+--+  +  +  +--+  +
|     |     |     |  |     |        |     |  |  |  |     |  |
+--+  +--+--+--+  +  +--+--+  +--+--+--+  +  +  +--+--+  +  +
|     |        |     |     |  |        |  |  |           |  |
+  +--+  +  +--+--+  +  +  +  +  +--+  +  +  +--+--+--+  +  +
|  |     |           |  |     |     |  |  |           |  |  |
+  +  +--+--+--+--+--+  +--+--+--+  +--+  +  +--+  +--+  +  +
|  |        |  |                    |     |  |     |     |  |
+  +--+--+  +  +  +--+--+--+--+--+  +  +--+  +  +--+  +--+  +
|        |  |        |     |        |  |     |           |  |
+  +  +  +  +--+--+--+  +  +--+--+  +  +--+--+  +--+--+--+  +
|  |  |  |              |        |  |     |  |  |        |  |
+  +  +--+--+--+--+--+--+--+--+  +  +--+  +  +--+  +--+  +  +
|  |  |                    |     |     |  |  |     |  |  |  |
+  +  +  +--+--+--+--+  +  +  +--+--+  +  +  +  +--+  +  +  +
|  |  |  |     |  |     |  |  |     |  |  |     |     |     |
+--+  +  +  +  +  +  +--+--+  +  +  +--+  +--+--+  +--+--+--+
|     |  |  |     |     |     |  |        |              |  |
+  +  +  +  +--+--+--+  +  +--+  +--+--+--+  +--+--+  +  +  +
|  |  |  |     |        |     |  |           |     |  |     |
+  +  +  +--+  +  +--+  +--+  +  +  +--+--+--+  +  +  +--+  +
|  |  |        |  |        |  |     |  |        |     |     |
+  +  +--+--+  +  +--+--+  +  +  +--+  +  +--+--+--+--+  +--+
|  |        |  |  |     |  |  |  |     |  |        |     |  |
+  +--+--+  +  +  +  +  +--+  +  +  +  +  +  +--+  +  +--+  +
|  |     |  |  |     |  |     |     |  |  |     |  |        |
+  +  +  +--+  +--+--+  +  +--+--+--+--+  +  +  +--+--+--+  +
|     |              |                    |  |              |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+