A bit of info about the maze test datasets here

These mazes were designed to help test an algorithm that
always follows the right wall.  Some of the mazes may be
less helpful for a left-following algorithm.

Valid mazes:
    maze01.txt
    maze02.txt
    maze03.txt
    maze04.txt
    maze05.txt
    maze06.txt
    maze07.txt
    maze08.txt
    maze09.txt
    maze10.txt
    maze11.txt
    maze12.txt
    maze15.txt
    maze20.txt     - my program treats is as valid but may not be due to open wall
    maze25.txt     - has comments and blank lines
    maze26.txt     - larger, irregular maze
    maze26_alt.txt - same as maze26, but uses alternative characters
    maze27.txt     - large maze which tripped up my solver until I added a path stack
    maze27_alt.txt - same as maze27, but uses alternative characters
    maze28.txt     - very small maze that tripped up my solver until I added a path stack
    maze30.txt     - maze27 with exit in a different location

Invalid:
    maze13.txt - No ending location
    maze14.txt - No route to exit
    maze16.txt - No starting location
    maze17.txt - Multiple starting locations
    maze18.txt - Multiple starting locations
    maze19.txt - Empty file
    maze21.txt - Hallway is more than one space wide
    maze22.txt - Hallway is more than one space wide
    maze23.txt - Hallway is more than one space wide
    maze24.txt - No solution / maybe invalid due to open wall
    maze29.txt - Multiple exit locations


Oh, and if you want to quickly test the maze solvers included here
from the command line, you can do (copy and paste into your terminal)

for F in mazes/maze*.txt; do 
    ./maze.py $F 0 >/dev/null && echo "$F succeeded" || echo "$F failed"
done


and for a bit more info about failed mazes:

for F in mazes/maze*.txt; do 
    ./maze.py $F 0 >maze.out && echo "$F succeeded" || \
    (echo "$F failed"; tail -n 2 maze.out; echo)
done; rm maze.out


There is also a utility to flip mazes horizontally or vertically, flip.py

You might try ./flip.py mazes/<whatever_maze> - hv | ./maze_recurse.py - .02