diff --git a/exercises/ex01/ex01.py b/exercises/ex01/ex01.py
index ca880cb..ad42cfd 100644
--- a/exercises/ex01/ex01.py
+++ b/exercises/ex01/ex01.py
@@ -1,9 +1,6 @@
 """
-# hello.py
-
-The window that appears should contain a cursor awaiting your input,
-but it’s different from the interactive shell, which runs Python instructions
-Python Basics as soon as you press enter.
+Your First Program
+Page 11
 """
 
 print("Nombre:")
diff --git a/exercises/ex03/ex03.py b/exercises/ex03/ex03.py
index b6a476a..d4ce55c 100644
--- a/exercises/ex03/ex03.py
+++ b/exercises/ex03/ex03.py
@@ -1,16 +1,6 @@
 """
-# collatz()
-
-Write a function named collatz() that has one parameter named number. If
-number is even, then collatz() should print number / 2 and return this value.
-If number is odd, then collatz() should print and return 3 * number + 1.
-
-Then write a program that lets the user type in an integer and that
-keeps calling collatz() on that number until the function returns the value 1.
-(Amazingly enough, this sequence actually works for any integer—sooner or
-later, using this sequence, you’ll arrive at 1! Even mathematicians aren’t sure
-why. Your program is exploring what’s called the Collatz sequence, sometimes
-called “the simplest impossible math problem.”)
+Practice Projects
+Page 76
 """
 
 import time
diff --git a/exercises/ex04/ex04a.py b/exercises/ex04/ex04a.py
index 28a292c..dfc7234 100644
--- a/exercises/ex04/ex04a.py
+++ b/exercises/ex04/ex04a.py
@@ -1,3 +1,9 @@
+"""
+Practice Projects: Comma Code
+Page 107
+"""
+
+
 def add(ls):
     if len(ls) > 0:
         ls = list(map(lambda x: str(x), ls))
diff --git a/exercises/ex04/ex04b.py b/exercises/ex04/ex04b.py
index 513b90e..b7f5b74 100644
--- a/exercises/ex04/ex04b.py
+++ b/exercises/ex04/ex04b.py
@@ -1,3 +1,8 @@
+"""
+Practice Projects: Coin Flip Streaks
+Page 107
+"""
+
 import random
 
 
diff --git a/exercises/ex04/ex04c.py b/exercises/ex04/ex04c.py
index 886b7fc..c3125ac 100644
--- a/exercises/ex04/ex04c.py
+++ b/exercises/ex04/ex04c.py
@@ -1,3 +1,8 @@
+"""
+Practice Projects: Character Picture Grid
+Page 108
+"""
+
 grid = [
     [".", ".", ".", ".", ".", "."],
     [".", "0", "0", ".", ".", "."],
diff --git a/exercises/ex05/ex05a.py b/exercises/ex05/ex05a.py
index 877c72d..42a949f 100644
--- a/exercises/ex05/ex05a.py
+++ b/exercises/ex05/ex05a.py
@@ -1,3 +1,8 @@
+"""
+Practice Projects: Chess Dictionary Validator
+Page 127
+"""
+
 import sys
 
 tests = [
diff --git a/exercises/ex05/ex05b.py b/exercises/ex05/ex05b.py
index 1506ad5..85d43e8 100644
--- a/exercises/ex05/ex05b.py
+++ b/exercises/ex05/ex05b.py
@@ -1,8 +1,13 @@
+"""
+Practice Projects: Fantasy Game Inventory
+Page 127
+"""
+
 import sys
 
 tests = [
-    {'rope': 1, 'torch': 6, 'gold coin': 42, 'dagger': 1, 'arrow': 12},
-    {'rope': 1, 'torch': 6, 'gold coin': "a", 'dagger': 1, 'arrow': 12},
+    {"rope": 1, "torch": 6, "gold coin": 42, "dagger": 1, "arrow": 12},
+    {"rope": 1, "torch": 6, "gold coin": "a", "dagger": 1, "arrow": 12},
     None,
 ]
 
diff --git a/exercises/ex05/ex05c.py b/exercises/ex05/ex05c.py
index 6e1d322..0ef3ba9 100644
--- a/exercises/ex05/ex05c.py
+++ b/exercises/ex05/ex05c.py
@@ -1,9 +1,14 @@
+"""
+Practice Projects: List to Dictionary Function for Fantasy Game Inventory
+Page 128
+"""
+
 import sys
 
-dragonLoot = ['gold coin', 'dagger', 'gold coin', 'gold coin', 'ruby']
+dragonLoot = ["gold coin", "dagger", "gold coin", "gold coin", "ruby"]
 tests = [
-    {'rope': 1, 'torch': 6, 'gold coin': 42, 'dagger': 1, 'arrow': 12},
-    {'rope': 1, 'torch': 6, 'gold coin': "a", 'dagger': 1, 'arrow': 12},
+    {"rope": 1, "torch": 6, "gold coin": 42, "dagger": 1, "arrow": 12},
+    {"rope": 1, "torch": 6, "gold coin": "a", "dagger": 1, "arrow": 12},
     None,
 ]
 
diff --git a/exercises/ex06/ex06a.py b/exercises/ex06/ex06a.py
index a36b515..094f125 100644
--- a/exercises/ex06/ex06a.py
+++ b/exercises/ex06/ex06a.py
@@ -1,3 +1,8 @@
+"""
+Practice Projects: Table Printer
+Page 154
+"""
+
 tableData = [
     ["apples", "oranges", "cherries", "banana"],
     ["Alice", "Bob", "Carol", "David"],
diff --git a/exercises/ex06/ex06b.py b/exercises/ex06/ex06b.py
index 85da8e7..ca527d5 100644
--- a/exercises/ex06/ex06b.py
+++ b/exercises/ex06/ex06b.py
@@ -1,3 +1,8 @@
+"""
+Practice Projects: Zombie Dice Bots
+Page 155
+"""
+
 import random
 import zombiedice
 
diff --git a/exercises/ex07/ex07a.py b/exercises/ex07/ex07a.py
index 46cb5c0..ff0035c 100644
--- a/exercises/ex07/ex07a.py
+++ b/exercises/ex07/ex07a.py
@@ -1,6 +1,12 @@
+"""
+Project: Phone Number and Email Address Extractor
+Page 179
+"""
+
 import re
 import pyperclip
 
+
 def to_int(string):
     string = re.sub(r"\D", "", string)
     if string:
@@ -8,18 +14,22 @@ def to_int(string):
     else:
         return None
 
+
 def rgx_phones():
     return re.compile(
-        r"((\+(\d+)\s*)?(([ |\d|\-|\.|\(|\)]){7,}\d)(\s+ext\S*\s+(\d+))?)", re.I
+        r"((\+(\d+)\s*)?(([ |\d|\-|\.|\(|\)]){7,}\d)(\s+ext\S*\s+(\d+))?)",
+        re.I,
     )
 
+
 def rgx_emails():
     return re.compile(r"[\w\-]+@[\w\-]+\.\w{2,}", re.I)
-    
+
+
 def parse_phone(phone):
-    lbraces = len(re.findall(r'.*\(.*', phone[0]))
-    rbraces = len(re.findall(r'.*\).*', phone[0]))
-    if lbraces == rbraces and re.match(r'^[\+|\d]', phone[0]):
+    lbraces = len(re.findall(r".*\(.*", phone[0]))
+    rbraces = len(re.findall(r".*\).*", phone[0]))
+    if lbraces == rbraces and re.match(r"^[\+|\d]", phone[0]):
         code = to_int(phone[2])
         ext = to_int(phone[6])
         res = to_int(phone[3])
@@ -28,9 +38,11 @@ def parse_phone(phone):
         res = f"{res} ext. {ext}" if ext else res
         return res
 
+
 def get_phones(content):
     return list(filter(None, map(parse_phone, rgx_phones().findall(content))))
 
+
 content = pyperclip.paste()
 phones = get_phones(content)
 emails = rgx_emails().findall(content)
diff --git a/exercises/ex08/ex08a.py b/exercises/ex08/ex08a.py
index e3c6e33..1776396 100644
--- a/exercises/ex08/ex08a.py
+++ b/exercises/ex08/ex08a.py
@@ -1,29 +1,66 @@
+"""
+Project: Sandwich Maker
+Page 198
+"""
+
 import pyinputplus as pyip
 
-prices, order, total = {
-    "bread": { "wheat": 1.0, "white": .9, "sourdough": 1.1, },
-    "protein": { "chicken": 1.0, "turkey": 1.1, "ham": .9, "tofu": .8, },
-    "cheese": { "cheddar": .9, "swiss": 1.0, "mozzarella.": 1.1, }
-}, {}, 0
+prices, order, total = (
+    {
+        "bread": {
+            "wheat": 1.0,
+            "white": 0.9,
+            "sourdough": 1.1,
+        },
+        "protein": {
+            "chicken": 1.0,
+            "turkey": 1.1,
+            "ham": 0.9,
+            "tofu": 0.8,
+        },
+        "cheese": {
+            "cheddar": 0.9,
+            "swiss": 1.0,
+            "mozzarella.": 1.1,
+        },
+    },
+    {},
+    0,
+)
+
 
 def add(key, ismenu=False):
     isadd = pyip.inputYesNo(prompt=f"Do you want {key}? [y/n]\n") == "yes"
     if isadd and ismenu:
-        return pyip.inputMenu(list(prices[key].keys()), numbered=True, prompt=f"Please, select {key}:\n")
+        return pyip.inputMenu(
+            list(prices[key].keys()),
+            numbered=True,
+            prompt=f"Please, select {key}:\n",
+        )
     elif isadd:
         return True
     else:
         return False
 
 
-order["bread"] = pyip.inputMenu(list(prices["bread"].keys()), numbered=True, prompt="Please, select bread:\n")
-order["protein"] = pyip.inputMenu(list(prices["protein"].keys()), numbered=True, prompt="Please, select protein:\n")
+order["bread"] = pyip.inputMenu(
+    list(prices["bread"].keys()),
+    numbered=True,
+    prompt="Please, select bread:\n",
+)
+order["protein"] = pyip.inputMenu(
+    list(prices["protein"].keys()),
+    numbered=True,
+    prompt="Please, select protein:\n",
+)
 order["cheese"] = add("cheese", True)
 order["mayo"] = add("mayo")
 order["mustard"] = add("mustard")
 order["lettuce"] = add("lettuce")
 order["tomato"] = add("tomato")
-order["quantity"] = pyip.inputInt(prompt="How many sandwiches? [number]:\n", greaterThan=0)
+order["quantity"] = pyip.inputInt(
+    prompt="How many sandwiches? [number]:\n", greaterThan=0
+)
 
 sandwich = "sandwich" if order["quantity"] == 1 else "sandwiches"
 print(f"Your order\n{order['quantity']} {sandwich} with:")
@@ -39,9 +76,8 @@ for key in order.keys():
         else:
             print(f"{prompt}NO {key}")
 subtotal = round(total * order["quantity"], 2)
-taxes = round(subtotal * .16, 2)
+taxes = round(subtotal * 0.16, 2)
 total = round(subtotal + taxes, 2)
 print(f"SUBTOTAL: {subtotal}")
 print(f"TAXES: {taxes}")
 print(f"TOTAL: {total}")
-
diff --git a/exercises/ex08/ex08b.py b/exercises/ex08/ex08b.py
index e69de29..9306bc1 100644
--- a/exercises/ex08/ex08b.py
+++ b/exercises/ex08/ex08b.py
@@ -0,0 +1,4 @@
+"""
+Project: Write Your Own Multiplication Quiz
+Page 199
+"""