diff --git a/devel-server.py b/devel-server.py
index 5543f83..0f15dfd 100755
--- a/devel-server.py
+++ b/devel-server.py
@@ -102,35 +102,69 @@ you are a fool.
         body = []
         path = self.path.rstrip('/')
         parts = path.split("/")
+        #raise ValueError(parts)
         if len(parts) < 3:
             # List all categories
             body.append("# Puzzle Categories")
             for i in glob.glob(os.path.join("puzzles", "*", "")):
                 body.append("* [{}](/{})".format(i, i))
-        elif len(parts) == 3:
+            self.serve_md('\n'.join(body))
+            return
+
+        fpath = os.path.join("puzzles", parts[2])
+        cat = puzzles.Category(fpath, seed)
+        if len(parts) == 3:
             # List all point values in a category
             body.append("# Puzzles in category `{}`".format(parts[2]))
-            fpath = os.path.join("puzzles", parts[2])
-            cat = puzzles.Category(fpath, seed)
             for points in cat.pointvals:
                 body.append("* [puzzles/{cat}/{points}](/puzzles/{cat}/{points}/)".format(cat=parts[2], points=points))
-        elif len(parts) == 4:
+            self.serve_md('\n'.join(body))
+            return
+
+        pzl = cat.puzzle(int(parts[3]))
+        if len(parts) == 4:
             body.append("# {} puzzle {}".format(parts[2], parts[3]))
-            fpath = os.path.join("puzzles", parts[2])
-            cat = puzzles.Category(fpath, seed)
-            p = cat.puzzle(int(parts[3]))
-            body.append("* Author: `{}`".format(p['author']))
-            body.append("* Summary: `{}`".format(p['summary']))
+            body.append("* Author: `{}`".format(pzl['author']))
+            body.append("* Summary: `{}`".format(pzl['summary']))
             body.append('')
             body.append("## Body")
-            body.append(p.body)
+            body.append(pzl.body)
             body.append("## Answers")
-            for a in p['answers']:
+            for a in pzl['answer']:
                 body.append("* `{}`".format(a))
             body.append("")
+            body.append("## Files")
+            for pzl_file in pzl['files']:
+                body.append("* [puzzles/{cat}/{points}/{filename}]({filename})"
+                            .format(cat=parts[2], points=pzl.points, filename=pzl_file))
+            self.serve_md('\n'.join(body))
+            return
+        elif len(parts) == 5:
+            try:
+                self.serve_puzzle_file(pzl['files'][parts[4]])
+            except KeyError:
+                self.send_error(HTTPStatus.NOT_FOUND, "File not found")
+                return
         else:
             body.append("# Not Implemented Yet")
-        self.serve_md('\n'.join(body))
+            self.serve_md('\n'.join(body))
+
+    CHUNK_SIZE = 4096
+    def serve_puzzle_file(self, file):
+        """Serve a PuzzleFile object."""
+        self.send_response(HTTPStatus.OK)
+        self.send_header("Content-type", "application/octet-stream")
+        self.send_header('Content-Disposition', 'attachment; filename="{}"'.format(file.name))
+        if file.path is not None:
+            fs = os.stat(file.path)
+            self.send_header("Last-Modified", self.date_time_string(fs.st_mtime))
+
+        # We're using application/octet stream, so we can send the raw bytes.
+        self.end_headers()
+        chunk = file.handle.read(self.CHUNK_SIZE)
+        while chunk:
+            self.wfile.write(chunk)
+            chunk = file.handle.read(self.CHUNK_SIZE)
 
     def serve_file(self):
         if self.path.endswith(".md"):
diff --git a/puzzles.py b/puzzles.py
index 3923f89..df18c0c 100644
--- a/puzzles.py
+++ b/puzzles.py
@@ -94,6 +94,9 @@ class Puzzle:
         self.message = bytes(random.choice(messageChars) for i in range(20))
         self.body = ''
 
+        # This defaults to a dict, not a list like most things
+        self._dict['files'] = {}
+
         # A list of temporary files we've created that will need to be deleted.
         self._temp_files = []
         if path is not None:
@@ -171,18 +174,17 @@ class Puzzle:
 
         # Make sure it actually exists.
         if not os.path.exists(path):
-            raise ValueError("Included file {} does not exist.")
+            raise ValueError("Included file {} does not exist.".format(path))
 
         file = open(path, 'rb')
 
         return PuzzleFile(path=path, handle=file, name=name, visible=visible)
 
-    def make_temp_file(self, name=None, mode='rw+b', visible=True):
+    def make_temp_file(self, name=None, visible=True):
         """Get a file object for adding dynamically generated data to the puzzle. When you're
         done with this file, flush it, but don't close it.
         :param name: The name of the file for links within the puzzle. If this is None, a name
                      will be generated for you.
-        :param mode: The mode under which
         :param visible: Whether or not the file will be visible to the user.
         :return: A file object for writing
         """
@@ -190,7 +192,7 @@ class Puzzle:
         if name is None:
             name = self.random_hash()
 
-        file = tempfile.NamedTemporaryFile(mode=mode, delete=False)
+        file = tempfile.NamedTemporaryFile(mode='w+b', delete=False)
         file_read = open(file.name, 'rb')
 
         self._dict['files'][name] = PuzzleFile(path=file.name, handle=file_read,
@@ -313,7 +315,7 @@ class Category:
 
     def puzzle(self, points):
         path = os.path.join(self.path, str(points))
-        return Puzzle(path, self.seed)
+        return Puzzle(self.seed, path=path)
 
     def puzzles(self):
         for points in self.pointvals: