A random depth-first search maze generator in Haskell.
$ stack build --exec 'amaze 5 5'
_ _ _ _
|_ | _ |
| |_ | |
| |_ _|_| |
| _ _ _ _|
|_ _ _ _ |
$ stack build --exec 'amaze 10 10'
_ _ _ _ _ _ _ _ _
| | | | | |
| | | |_ _| | _| |_|
| _|_ | _|_ |_ |
| | | _| | | | | |
| _| | _| |_| | | |
|_| _|_ |_ _ _| |
| _| _|_ |_ _| |
| |_ _ _| | _ _| |
|_ _ _| | |_ | | |
|_ _ _ _|_ _ _ _|_ |
$ stack build --exec 'amaze 15 15'
_ _ _ _ _ _ _ _ _ _ _ _ _ _
|_ | _ _ |_ | | |_ |
| _|_ _| |_ _ _| | _| |_ _ |
|_ _ | | _| _|_ _| | | |
| _ | |_ _ |_ | _ _| | |_|
|_ |_| | _|_ _ _|_ _ _|_ |
| _| _| _ _ _ |_ _ _ _| |
| | _|_ _|_ |_ |_ _ _ | |
| | |_ _ |_ |_ _ _|_ _| |
| |_ | | |_ |_ _ | _| _|
| |_ _| _ _| _ _|_|_ | | |
|_|_ | _| _ | | | |_ |
| _ _| | _| |_ _|_ _| | _ _|
| | _|_ _ _ _ | _| | | |
| | | | | |_ _ _| _|_ _| |
|_|_ _ _|_ _|_ _ _ _ _|_ _ _ |
$ stack build --exec 'amaze 20 20'
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
| | _ _ _ |_ _ _ _ | _ | |
| | | | | |_ |_| |_ | _| | | | | | |
|_| |_ _| | |_ |_ | | |_ | | _|_| |
| | | _| | _|_ _ _| |_ |_| |_ _ | |
| |_ _|_ _|_| | | _ | |_ | |_ _ _ _|
| | _ _ _ | |_ _| | | _ _| | _ |
| | | | | | | |_ | | | _ _|_ _ _| |
|_ _| | | |_ _|_ _ _| | | | |_ _ | |
| _|_ _| _ _ | |_ _|_ | _| | |_|
| |_| | _ _| _| |_ _ | | | | _|_ |
|_ | |_ _ _| _| _| | | |_ _|_ | _|
| _|_ | _ _| _ _ _|_| | _| _|_ |
| _ _ _| | _ _ _| _ _ _| |_ _ _|_ | |
| | | | | | | _| _ |_ |_ _ _| |
|_ _|_ | |_ _| |_ | | |_ |_ _ _ | |
| _ _ _|_ | |_ |_ _| | | _ |_| | |
| | | | _| _ _| _ _| | | | |_ _ _| |
|_ | |_ _|_ _ _ _| | _|_ _| | _ | _|
| _|_ _ _ | _ _ _|_ _ _ _| | _| | |
|_ _ _ _ _|_ _ _ _ _ _ _ _ _|_ _|_ _ _ |
$ stack build --exec 'amaze 25 25'
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
|_ _ _ _ _ _ _ _ _ _ | _ _ _ | _ _ |_ _ _ |
| _ _ | _ _ _| _ |_ _|_ _ | | | _|_ _ _ _ |
|_ | | |_ _ | | | | | _ _|_ _| | _ _| _|
| _| |_ | |_ _ _|_ | |_| _ _ _|_ |_ _ _| |
| | _ _ _ _|_| _ _ |_|_ _ _ _|_ |_ _ |_ |
| |_| _ _ | _|_ |_ _ _ | _| _ _|_ _ |_ | |
| | | | |_ _ | |_ | | | | | _| _| | | |
| | | | | |_ _ _|_ _|_ | | |_ | | |_ | | | | |
| | | | |_ _ | _ _|_ | | _| |_ |_ _ _|_|_ |
|_| | |_ |_ _ _| | _ _| |_ _| | _ _| | _ _|
| _|_ _ _|_ | _ _|_ | _| | |_| | |_ _| |
| _ _| _ _| | _ | |_ _ _| |_ _ _| | _ _ _| |
|_| | _ _| | _| | _|_ _ | | | _ | _| |_ _|
| _| | | |_ | |_ _ _ | | | | | | |_ _| |_ _ |
| | | | | | | |_ _|_ _ _| |_ |_ _ _ _ _| |
| | | |_ _| | |_|_ | | _ _ _ | |_ _ | _ _ _|_|
|_| |_ | |_ _ _ _| |_ _ _ |_ _ _| _|_ _ _ _ |
| | _| | | | _ | | _ _| _ | | | | | |
| |_| | _| | _| |_ _ |_ _ _ _| _|_ | |_ _| | |
| _ _| | | |_ _|_ | |_ _ _ _ |_ _ _ _| | | _| |
| | _ |_ _ _ _ | | | | _ _| _ _| _| _| |
| |_ |_ |_ _|_ _| | | |_ _ | | _| | |_ _| |
|_ |_ |_ | | _ | _| _ _|_| |_| |_ _ | |
| |_ |_| _| | | | | |_| _|_ |_ _| |_ | | |
|_ _ _ _ _|_ _|_ _ _|_ _ _ _ _ _|_ _ _|_ _ _ _|_ |
$ stack build --exec 'amaze 30 30'
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
| |_ _ | _ _ _ _ _ | _ _ _ _ _ _ _ _ _ _ _ | |
| | |_ _ | |_ _ |_ _ | | |_ | _| | |_ |_ |_ _| |
| | | _ _| _| | | _| _| _| | _|_ _| |_ |_| _ _ _|
| | | |_ | |_ _ _| |_ | |_ _ |_ _| _ _ _| | |_ |_ | _|
| | | | _|_ |_ _ | _|_ | _ _ _ _|_ _ _ _ _ _| | _| |
| | | | | _ _ _ _ _| | | |_| | | _ _ _ _ | |_ |_| |
|_| | |_ _| _ | | | |_| | _|_ _|_ _|_ _ | _|_ |_ _ |
| _|_ _ | |_ _|_ _|_ | | | |_ _ _ | | | |_ | | |
| | _ | |_|_ | _ _ _ | | | |_ | _|_ | |_ _|_ | |_ _|
| |_| | | _ _| | | _|_ | | | | | | | _ | | | |
| | _|_| |_ |_ _| |_ _ | _| | | |_ _| | |_|_ |_| | _| |
| |_ |_ _| | _ | |_ |_ |_ _ | |_ _ |_ | |_ | |
| |_|_ _ | _| |_ | |_| _ _|_ _ | | | |_ | |_ | | |
| |_ _ _ |_| | _| | |_ _ _| _ | _| |_ _| |_ | | |_| |
|_ _| | _ _|_ |_ _| _ | _| | | |_ _ | | | _ _| | |
| _ _| |_ | | | |_ |_ _| _|_ _ _ | |_| |_| _ _| |_|
| | |_ | | |_ | | _| | _|_ | _ | |_ |_ _ |_ _ _ |
| | | | |_| |_| |_ _ _|_ _|_ _ _|_ _ _|_ |_ _ _ _ |
|_| |_|_ _ | | | _|_ _ |_ | _ | _ _ | |_ _ _ _ |_|
| _| | _| | | | | | | | | _| | _ _| |_ _|_ |
|_ _ _| | |_ _| | | | |_ |_ _| | |_ _ _| |_ _ _ | |_| | |
| _ _ _|_ | _| | | | _| |_|_ | | | _ | |_ | |_ |
|_ _ _ | _| | _|_| | | | |_ | _| |_|_ _| _|_ _ |_ | |
| _ _ _| _ _| | _|_ | _| | |_ _ _ | | | |_ | |_|
| | _ |_| _ _| |_ | _| |_ _| | |_ _| | | |_ _| _|_ |
|_ _| _| _|_ _ _ | |_ _|_ | | |_ _ _ | |_ | _ _| _|
| _ _| _| _ _ |_| | _ _ _|_| | | | _|_ |_ _| |_ |
| | | | _ | | | | |_ _ _ _| | | _ _ _| | | |_ | |
| | |_ _|_ _| | | | | | | _ _| _ _| |_| _ |_ _| |_ |_ |
|_ _ _ _ _ _ _|_ _ _|_|_ _|_ _ _ _ _|_ _ _ _|_ _ _ _ _ _|_ |