diff --git a/devel/moth.py b/devel/moth.py
index 1875bd7..de6456b 100644
--- a/devel/moth.py
+++ b/devel/moth.py
@@ -2,6 +2,7 @@
 
 import argparse
 import contextlib
+import copy
 import glob
 import hashlib
 import html
@@ -11,6 +12,7 @@ import mistune
 import os
 import random
 import string
+import sys
 import tempfile
 import shlex
 import yaml
@@ -27,9 +29,25 @@ def djb2hash(str):
 def pushd(newdir):
     curdir = os.getcwd()
     os.chdir(newdir)
+
+    # Force a copy of the old path, instead of just a reference
+    old_path = list(sys.path)
+    old_modules = copy.copy(sys.modules)
+    sys.path.append(newdir)
+
     try:
         yield
     finally:
+        # Restore the old path
+        to_remove = []
+        for module in sys.modules:
+            if module not in old_modules:
+                to_remove.append(module)
+
+        for module in to_remove:
+            del(sys.modules[module])
+
+        sys.path = old_path
         os.chdir(curdir)
 
 
@@ -363,7 +381,7 @@ class Puzzle:
 
         files = [fn for fn,f in self.files.items() if f.visible]
         return {
-            'authors': self.authors,
+            'authors': self.get_authors(),
             'hashes': self.hashes(),
             'files': files,
             'scripts': self.scripts,
@@ -411,7 +429,8 @@ class Category:
             with pushd(self.path):
                 self.catmod.make(points, puzzle)
         else:
-            puzzle.read_directory(path)
+            with pushd(self.path):
+                puzzle.read_directory(path)
         return puzzle
 
     def __iter__(self):
diff --git a/example-puzzles/example/200/puzzle.py b/example-puzzles/example/200/puzzle.py
new file mode 100755
index 0000000..cfb9614
--- /dev/null
+++ b/example-puzzles/example/200/puzzle.py
@@ -0,0 +1,19 @@
+import io
+import categorylib  # Category-level libraries can be imported here
+
+def make(puzzle):
+    import puzzlelib  # puzzle-level libraries can only be imported inside of the make function
+    puzzle.authors = ['donaldson']
+    puzzle.summary = 'more crazy stuff you can do with puzzle generation using Python libraries'
+
+    puzzle.body.write("## Crazy Things You Can Do With Puzzle Generation (part II)\n")
+    puzzle.body.write("\n")
+    puzzle.body.write("The source to this puzzle has some more advanced examples of stuff you can do in Python.\n")
+    puzzle.body.write("\n")
+    puzzle.body.write("1 == %s\n\n" % puzzlelib.getone(),)
+    puzzle.body.write("2 == %s\n\n" % categorylib.gettwo(),)
+
+    puzzle.answers.append('tea')
+    answer = puzzle.make_answer()        # Generates a random answer, appending it to puzzle.answers too
+    puzzle.log("Answers: {}".format(puzzle.answers))
+
diff --git a/example-puzzles/example/200/puzzlelib.py b/example-puzzles/example/200/puzzlelib.py
new file mode 100644
index 0000000..566be76
--- /dev/null
+++ b/example-puzzles/example/200/puzzlelib.py
@@ -0,0 +1,7 @@
+"""This is an example of a puzzle-level library.
+
+This library can be imported by sibling puzzles using `import puzzlelib`
+"""
+
+def getone():
+    return 1
diff --git a/example-puzzles/example/categorylib.py b/example-puzzles/example/categorylib.py
new file mode 100644
index 0000000..fb5a230
--- /dev/null
+++ b/example-puzzles/example/categorylib.py
@@ -0,0 +1,7 @@
+"""This is an example of a category-level library.
+
+This library can be imported by child puzzles using `import categorylib`
+"""
+
+def gettwo():
+    return 2