diff --git a/13_Bounce/python/bounce.py b/13_Bounce/python/bounce.py
index fc11c204..f36acc94 100644
--- a/13_Bounce/python/bounce.py
+++ b/13_Bounce/python/bounce.py
@@ -6,7 +6,7 @@ A physics simulation
 Ported by Dave LeCompte
 """
 
-from typing import Tuple
+from typing import Tuple, List
 
 PAGE_WIDTH = 64
 
@@ -51,8 +51,8 @@ def print_at_tab(line: str, tab: int, s: str) -> str:
     return line
 
 
-def run_simulation(delta_t, v0, coeff_rest) -> None:
-    bounce_time = [0] * 20  # time of each bounce
+def run_simulation(delta_t: float, v0: float, coeff_rest: float) -> None:
+    bounce_time: List[float] = [0] * 20  # time of each bounce
 
     print("FEET")
     print()
@@ -67,7 +67,7 @@ def run_simulation(delta_t, v0, coeff_rest) -> None:
         line = ""
         if int(h) == h:
             line += str(int(h))
-        total_time = 0
+        total_time: float = 0
         for i in range(1, sim_dur + 1):
             tm: float = 0
             while tm <= bounce_time[i]:
diff --git a/13_Bounce/python/test_bounce.py b/13_Bounce/python/test_bounce.py
new file mode 100644
index 00000000..2960919d
--- /dev/null
+++ b/13_Bounce/python/test_bounce.py
@@ -0,0 +1,72 @@
+import io
+
+from _pytest.monkeypatch import MonkeyPatch
+from _pytest.capture import CaptureFixture
+
+from bounce import main
+
+
+def test_bounce(monkeypatch: MonkeyPatch, capsys: CaptureFixture[str]) -> None:
+    time_increment = 0.1
+    velocity = 30
+    coefficient = 1
+    monkeypatch.setattr(
+        "sys.stdin",
+        io.StringIO(f"{time_increment:0.1f}\n{velocity}\n{coefficient}\n"),
+    )
+    main()
+    actual = capsys.readouterr().out
+    expected = """                             BOUNCE
+           CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY
+
+
+
+THIS SIMULATION LETS YOU SPECIFY THE INITIAL VELOCITY
+OF A BALL THROWN STRAIGHT UP, AND THE COEFFICIENT OF
+ELASTICITY OF THE BALL.  PLEASE USE A DECIMAL FRACTION
+COEFFICIENCY (LESS THAN 1).
+
+YOU ALSO SPECIFY THE TIME INCREMENT TO BE USED IN
+'STROBING' THE BALL'S FLIGHT (TRY .1 INITIALLY).
+
+TIME INCREMENT (SEC)? 
+VELOCITY (FPS)? 
+COEFFICIENT? 
+FEET
+
+14      000                 000               000
+           0                   0                 0
+13     0     0             0    0            0    0
+
+12    0       0           0      0           0     0
+
+11   0                   0                  0
+               0                  0                 0
+10
+     0                  0                  0
+9               0                  0                 0
+
+8
+    0                  0                  0
+7                0                  0                 0
+
+6
+   0                  0                  0
+5                 0                  0                 0
+
+4
+
+3 0                  0                  0
+
+2                  0                  0                 0
+
+1
+
+00                  0                  0
+...................................................................
+ 0        1         2         3         4         5         6
+
+                               SECONDS
+
+"""  # noqa: W291
+    assert actual.split("\n") == expected.split("\n")
diff --git a/14_Bowling/python/bowling.py b/14_Bowling/python/bowling.py
index d4e66ab4..f4a566aa 100644
--- a/14_Bowling/python/bowling.py
+++ b/14_Bowling/python/bowling.py
@@ -1,14 +1,15 @@
 import random
+from typing import List
 
 
-def simulate_roll(pins) -> None:
+def simulate_roll(pins: List[int]) -> None:
     for _ in range(20):
         x = random.randint(0, 14)
         if x < len(pins):
             pins[x] = 1
 
 
-def calculate_score(rolls) -> int:
+def calculate_score(rolls: List[int]) -> int:
     score = 0
     frame = 1
     b = 1
@@ -32,11 +33,11 @@ def calculate_score(rolls) -> int:
 
 
 class Player:
-    def __init__(self, name):
+    def __init__(self, name: str):
         self.name = name
-        self.rolls = []
+        self.rolls: List[int] = []
 
-    def play_frame(self, frame):
+    def play_frame(self, frame: int) -> None:
         extra = 0
         prev_score = 0
         pins = [0] * 10  # reset the pins
@@ -73,10 +74,10 @@ class Player:
                 score = sum(pins)
                 self.rolls.append(score)
 
-    def __str__(self):
+    def __str__(self) -> str:
         return f"{self.name}: {self.rolls}, total:{calculate_score(self.rolls)}"
 
-    def show(self, pins):
+    def show(self, pins: List[int]) -> None:
         pins_iter = iter(pins)
         print()
         for row in range(4):
@@ -87,14 +88,14 @@ class Player:
             print()
 
 
-def centreText(text, width):
+def centre_text(text: str, width: int) -> str:
     t = len(text)
     return (" " * ((width - t) // 2)) + text
 
 
 def main() -> None:
-    print(centreText("Bowl", 80))
-    print(centreText("CREATIVE COMPUTING MORRISTOWN, NEW JERSEY", 80))
+    print(centre_text("Bowl", 80))
+    print(centre_text("CREATIVE COMPUTING MORRISTOWN, NEW JERSEY", 80))
     print()
     print("WELCOME TO THE ALLEY.")
     print("BRING YOUR FRIENDS.")
diff --git a/14_Bowling/python/test_bowling.py b/14_Bowling/python/test_bowling.py
new file mode 100644
index 00000000..04bb7cf6
--- /dev/null
+++ b/14_Bowling/python/test_bowling.py
@@ -0,0 +1,273 @@
+import io
+from typing import List
+
+from _pytest.capture import CaptureFixture
+from _pytest.monkeypatch import MonkeyPatch
+
+from bowling import main
+
+
+def test_bowling_strikes(monkeypatch: MonkeyPatch, capsys: CaptureFixture[str]) -> None:
+    def perfect_roll(pins: List[int]) -> None:
+        for i in range(20):
+            x = i
+            if x < len(pins):
+                pins[x] = 1
+
+    monkeypatch.setattr("bowling.simulate_roll", perfect_roll)
+
+    instructions1 = "Y"
+    players1 = 1
+    name1 = "Martin"
+    another_game1 = "Y"
+
+    instructions2 = "N"
+    players2 = 2
+    name21 = "Anna"
+    name22 = "Bob"
+    another_game2 = "N"
+    monkeypatch.setattr(
+        "sys.stdin",
+        io.StringIO(
+            f"{instructions1}\n{players1}\n{name1}\n{another_game1}\n"
+            f"{instructions2}\n{players2}\n{name21}\n{name22}\n{another_game2}"
+        ),
+    )
+    main()
+    actual = capsys.readouterr().out
+    expected = """                                      Bowl
+                   CREATIVE COMPUTING MORRISTOWN, NEW JERSEY
+
+WELCOME TO THE ALLEY.
+BRING YOUR FRIENDS.
+OKAY LET'S FIRST GET ACQUAINTED.
+
+THE INSTRUCTIONS (Y/N)? THE GAME OF BOWLING TAKES MIND AND SKILL. DURING THE GAME
+THE COMPUTER WILL KEEP SCORE. YOU MAY COMPETE WITH
+OTHER PLAYERS[UP TO FOUR]. YOU WILL BE PLAYING TEN FRAMES.
+ON THE PIN DIAGRAM 'O' MEANS THE PIN IS DOWN...'+' MEANS THE
+PIN IS STANDING. AFTER THE GAME THE COMPUTER WILL SHOW YOUR
+SCORES.
+FIRST OF ALL...HOW MANY ARE PLAYING? 
+VERY GOOD...
+Enter name for player 1: 
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Martin
+STRIKE!!!
+Extra rolls for Martin
+Martin: [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10], total:300
+DO YOU WANT ANOTHER GAME? 
+THE INSTRUCTIONS (Y/N)? FIRST OF ALL...HOW MANY ARE PLAYING? 
+VERY GOOD...
+Enter name for player 1: Enter name for player 2: 
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Anna
+STRIKE!!!
+Extra rolls for Anna
+
+O O O O 
+ O O O 
+  O O 
+   O 
+10 for Bob
+STRIKE!!!
+Extra rolls for Bob
+Anna: [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10], total:300
+Bob: [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10], total:300
+DO YOU WANT ANOTHER GAME? """  # noqa: W291
+    assert actual.split("\n") == expected.split("\n")