diff --git a/.commit_template b/.commit_template
new file mode 100644
index 0000000..05b6c62
--- /dev/null
+++ b/.commit_template
@@ -0,0 +1,24 @@
+
+
+# -----------------------------------------------------------------
+# Write your entire commit message above this line.
+# 
+# The first line should be a quick description of what you changed.
+# Then leave a blank line. 
+# Then, taking as many lines as you want, answer the questions 
+# corresponding to your checkpoint. 
+#
+# Checkpoint 1: 
+# - Was it difficult to figure out how to rewrite square() using 
+#   a for-loop? What strategies did you use to figure it out? 
+#
+# Checkpoint 2: 
+# - Describe something you understand well, or find interesting, about ranges. 
+# - Describe something you're still unsure about related to ranges. 
+#
+# Checkpoint 3: 
+# - Docstrings are meant for humans to read; they don't affect how a program runs. 
+#   When you write your own programs in the future, do you think you'll write 
+#   docstrings? Why or why not?
+
+
diff --git a/drawtiles.py b/drawtiles.py
new file mode 100644
index 0000000..d855f01
--- /dev/null
+++ b/drawtiles.py
@@ -0,0 +1,26 @@
+# drawtiles.py
+# ------------
+# By MWC Contributors
+#
+# Provides a command-line interface for drawing a grid of tiles.
+# Run `python drawtiles.py --help` for usage instructions.
+
+from tile import draw_tile
+from tile_grid import draw_tile_grid
+from superturtle.movement import no_delay
+from argparse import ArgumentParser
+
+parser = ArgumentParser("python drawtiles.py", description="Draws a grid of tiles.")
+parser.add_argument("width", type=int, help="How many tiles across the grid should be")
+parser.add_argument("height", type=int, help="How many tiles high the grid should be")
+parser.add_argument("size", type=int, help="Side length of each tile")
+parser.add_argument("--fast", action="store_true", help="Skip turtle animation and show the result")
+args = parser.parse_args()
+
+if args.fast:
+    with no_delay():
+        draw_tile_grid(args.width, args.height, args.size, draw_tile)
+else:
+    draw_tile_grid(args.width, args.height, args.size, draw_tile)
+input()
+
diff --git a/tile.py b/tile.py
index 91425f6..697cf8e 100644
--- a/tile.py
+++ b/tile.py
@@ -2,17 +2,23 @@ from turtle import *
 
 def draw_tile(size):
     "Draws one tile, which can be repeated to form a pattern."
-    color("grey")
+    draw_tile_outline(size)
+    draw_squiggle(size)
+
+def draw_tile_outline(size):
+    pencolor("#dddddd")
     square(size)
-    forward(size/2)
-    color("black")
+
+def draw_squiggle(size):
+    forward(size/4)
+    pencolor("black")
     left(90)
     quarter_arc_right(size/4)
     quarter_arc_left(size/4)
     quarter_arc_left(size/4)
     quarter_arc_right(size/4)
     left(90)
-    fly(size/2)
+    fly(size/4)
     left(90)
     fly(size)
     left(90)
@@ -25,14 +31,9 @@ def fly(distance):
 
 def square(size):
     "Draws a square of side length `size`"
-    forward(size)
-    left(90)
-    forward(size)
-    left(90)
-    forward(size)
-    left(90)
-    forward(size)
-    left(90)
+    for side in range(4):
+        forward(size)
+        left(90)
 
 def quarter_arc_right(radius):
     "Draws a quarter of an arc, turning to the right."
diff --git a/tile_drawing.py b/tile_drawing.py
deleted file mode 100644
index 95cbe9a..0000000
--- a/tile_drawing.py
+++ /dev/null
@@ -1,10 +0,0 @@
-from tile import draw_tile
-from tile_grid import draw_tile_grid
-from superturtle.motion import no_delay
-
-width = 10
-height = 8
-size = 10
-
-draw_tile_grid(width, height, size, draw_tile)
-
diff --git a/tile_grid.py b/tile_grid.py
index 9b37e4c..72a0f43 100644
--- a/tile_grid.py
+++ b/tile_grid.py
@@ -1,4 +1,11 @@
+# tile_grid.py
+# ------------
+# By MWC Contributors
+#
+# Implements `draw_tile_grid`, which draws a grid of tiles. 
+
 from turtle import *
+from tile import fly
 
 def draw_tile_grid(width, height, tile_size, tile_function):
     """Draws a (width x height) grid, with tile_function drawn on each tile.
@@ -8,32 +15,26 @@ def draw_tile_grid(width, height, tile_size, tile_function):
     for y in range(height):
         for x in range(width):
             tile_function(tile_size)
-            forward(tile_size)
+            fly(tile_size)
         return_to_x_origin(tile_size, width)
         move_up_one_row(tile_size)
     return_to_y_origin(tile_size, height)
 
 def return_to_x_origin(tile_size, width):
     "After drawing a row of tiles, returns the turtle to the starting x position"
-    penup()
-    back(tile_size * width)
-    pendown()
+    fly(-1 * tile_size * width)
 
 def return_to_y_origin(tile_size, height):
     "After drawing all rows of tiles, returns the turtle to the starting y position"
-    penup()
     right(90)
-    forward(tile_size * height)
+    fly(tile_size * height)
     left(90)
-    pendown()
 
 def move_up_one_row(tile_size):
     "Moves the turtle up one row"
-    penup()
     left(90)
-    forward(tile_size)
+    fly(tile_size)
     right(90)
-    pendown()