Cracked Tunnel
==============

+-- Ground level --------------------------------------------------------------------------------------------+
|                                                                                                            |
|            *                                                                                               |
|           /                                                                                                |
|          /                                                                                                 |
|         *                                                                                                  |
|        /                                                                                                   |
|       /                                                                                                    |
|      *     *--%                                                                                            |
|      |    / \ v                                                                                            |
|      |   /   \                                                                                             |
|      *  *     *                                                                                            |
|      | /       \                                                                                           |
|      |/         \                                                                                          |
|      *           *                                                                                         |
|      |                                                                                                     |
|      |                                                                                                     |
|      *                                                                                                     |
|     /                                                                                                      |
|    /                                                                                                       |
|   *                                                                                                        |
|  <                                                                                                         |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -1 ------------------------------------------------------------------------------------------------+
|                                                                                                            |
|               *           %                                                                                |
|                \         /v                                                                                |
|                 \       /                                                                                  |
|                  *     *                                                                                   |
|                   \   /                                                                                    |
|                    \ /                                                                                     |
|                     *                                                                                      |
|                     |                                                                                      |
|                     |                                                                                      |
|                     *                                                                                      |
|                    /                                                                                       |
|               ^   /                                                                                        |
|               %--*                                                                                         |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -2 ------------------------------------------------------------------------------------------------+
|                                                                                                            |
|                                          *                                                                 |
|                                         /                                                                  |
|                                        /                                                                   |
|                                       *                                                                    |
|                                      /                                                                     |
|                                     /                                                                      |
|                                    *                                                                       |
|                                   /                                                                        |
|                                  /                                                                         |
|                                 *--*--*                                                                    |
|                                /       \                                                                   |
|                           ^   /         \                                                                  |
|                           %--*           *                                                                 |
|                                          |\                                                                |
|                                          | \                                                               |
|                                          *  %                                                              |
|                                          |  v                                                              |
|                                          |                                                                 |
|                                          *                                                                 |
|                                          |                                                                 |
|                                          |                                                                 |
|                                          *                                                                 |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -3 ------------------------------------------------------------------------------------------------+
|                                                                                                            |
|                                                            *--*                                            |
|                                                           /    \                                           |
|                                                          /      \                                          |
|                                                         *        *                                         |
|                                                        /                                                   |
|                                                       /                                                    |
|                                                      *--*--*                                               |
|                                                     /                                                      |
|                                                    /                                                       |
|                                                   *                                                        |
|                                                  /                                                         |
|                                             ^   /                                                          |
|                                             %--*                                                           |
|                                                 \                                                          |
|                                                  \                                                         |
|                                                   *                                                        |
|                                                    \                                                       |
|                                                     \                                                      |
|                                                      *--*--*--*--*                                         |
|                                                         |   \     \                                        |
|                                                         |    \     \                                       |
|                                                         *     %     *                                      |
|                                                          \    v                                            |
|                                                           \                                                |
|                                                            *                                               |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -4 ------------------------------------------------------------------------------------------------+
|                                                               ^                                            |
|                                                               %                                            |
|                                                                \                                           |
|                                                                 \                                          |
|                                                                  *                                         |
|                                                                   \                                        |
|                                                                    \                                       |
|                                                                     *                                      |
|                                                                     |                                      |
|                                                                     |                                      |
|                                                                     %                                      |
|                                                                     v                                      |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -5 ------------------------------------------------------------------------------------------------+
|                                                                     ^                                      |
|                                                                     %                                      |
|                                                                     |                                      |
|                                                                     |                                      |
|                                                                     *                                      |
|                                                                     |                                      |
|                                                                     |                                      |
|                                                                     *                                      |
|                                                                     |\                                     |
|                                                                     | \                                    |
|                                                                     *  *--*--*                             |
|                                                                     |   \     \                            |
|                                                                     |    \     \                           |
|                                                                     *     %     *                          |
|                                                                      \    v                                |
|                                                                       \                                    |
|                                                                        *                                   |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -6 ------------------------------------------------------------------------------------------------+
|                                                                           ^                                |
|                                                                           %                                |
|                                                                           |                                |
|                                                                           |                                |
|                                                                           *                                |
|                                                                            \                               |
|                                                                             \                              |
|                                                                              *                             |
|                                                                              |\                            |
|                                                                              | \                           |
|                                                                              %  *                          |
|                                                                              v   \                         |
|                                                                                   \                        |
|                                                                                    *--*--*                 |
|                                                                                     \     \                |
|                                                                                      \     \               |
|                                                                                       *     *              |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -7 ------------------------------------------------------------------------------------------------+
|                                                                              ^                             |
|                                                                              %                             |
|                                                                             /                              |
|                                                                            /                               |
|                                                                           *                                |
|                                                                           |                                |
|                                                                           |                                |
|                                                                           *                                |
|                                                                          / \                               |
|                                                                         /   \                              |
|                                                                        *     %                             |
|                                                                       /      v                             |
|                                                                      /                                     |
|                                                                     *                                      |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -8 ------------------------------------------------------------------------------------------------+
|                                                                              ^                             |
|                                                                              %--*--*                       |
|                                                                                     \                      |
|                                                                                      \                     |
|                                                                                       %                    |
|                                                                                       v                    |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -9 ------------------------------------------------------------------------------------------------+
|                                                                                                            |
|                                                                                                *--*        |
|                                                                                               /            |
|                                                                                       ^      /             |
|                                                                                       %     *              |
|                                                                                        \   /               |
|                                                                                         \ /                |
|                                                                                          *--%              |
|                                                                                             v              |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -10 -----------------------------------------------------------------------------------------------+
|                                                                                             ^              |
|                                                                                             %              |
|                                                                                              \             |
|                                                                                               \            |
|                                                                                                *           |
|                                                                                               /|           |
|                                                                                              / |           |
|                                                                                             *  *           |
|                                                                                            /    \          |
|                                                                                           /      \         |
|                                                                                          *        *        |
|                                                                                                   |\       |
|                                                                                                   | \      |
|                                                                                                   *  *     |
|                                                                                                   |   \    |
|                                                                                                   |    \   |
|                                                                                                   %     *  |
|                                                                                                   v     |  |
|                                                                                                         |  |
|                                                                                                         *  |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -11 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^        |
|                                                                                                   %        |
|                                                                                                    \       |
|                                                                                                     \      |
|                                                                                                      *     |
|                                                                                                      |     |
|                                                                                                      |     |
|                                                                                                      *     |
|                                                                                                     /      |
|                                                                                                    /       |
|                                                                                                   %        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -12 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^        |
|                                                                                                   %        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -13 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^        |
|                                                                                                   %        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -14 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^        |
|                                                                                                   %        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -15 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^        |
|                                                                                                   %        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -16 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^        |
|                                                                                                   %        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -17 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^^       |
|                                                                                                   C        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -18 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^        |
|                                                                                                   %        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -19 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^        |
|                                                                                                   %        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -20 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^        |
|                                                                                                   %        |
|                                                                                                   v        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+

+-- Level -21 -----------------------------------------------------------------------------------------------+
|                                                                                                   ^^       |
|                                                                                                   M        |
|                                                                                                            |
+------------------------------------------------------------------------------------------------------------+