+-- Level +3 ---------------------------------------------------------------------------------+
| |
| % |
| vv |
| |
+---------------------------------------------------------------------------------------------+
+-- Level +2 ---------------------------------------------------------------------------------+
| ^ |
| % |
| v |
| |
+---------------------------------------------------------------------------------------------+
+-- Level +1 ---------------------------------------------------------------------------------+
| ^ |
| % |
| | |
| | |
| *--*--M |
| v |
| |
+---------------------------------------------------------------------------------------------+
+-- Ground level -----------------------------------------------------------------------------+
| ^ |
| % * * |
| \ / \ / |
| \ / \ / |
| *--* *--* * * |
| / \ & /| |
| / \ | / | |
| * * *--*--*--* * |
| / / \ |
| / / \ |
| * * * *--* *--*--* |
| \ \ | / \ / |
| \ \ | / \ / |
| * * *--*--* % |
| \ / / v |
| \ / / |
| * * * * |
| \ / / |
| \ / / |
| *--* * |
| | / |
| | / |
| * * *--* |
| / / \ / \ |
| / / \ / \ |
| * * * *--* *--* *--* *--* |
| / / / / \ / \ / \ \ |
| / / / / \ / \ / \ \ |
| * * *--* * *--* * *--* * * |
| \ / / \ | / | | \ |
| \ / / \|/ | | \ |
| *--*--* * * * * |
| \ \ | |
| \ \ | |
| * * *--*--*--* |
| / |
| / |
| * |
| & |
| / |
| * |
| v |
| |
+---------------------------------------------------------------------------------------------+
+-- Level -1 ---------------------------------------------------------------------------------+
| ^ |
| M |
| |
+---------------------------------------------------------------------------------------------+