diff --git a/2021-python/solutions/day_09.py b/2021-python/solutions/day_09.py
new file mode 100644
index 0000000..451805c
--- /dev/null
+++ b/2021-python/solutions/day_09.py
@@ -0,0 +1,34 @@
+from solutions import BaseSolution
+
+
+class Solution(BaseSolution):
+    input_file = "09.txt"
+
+    def __str__(self):
+        return "Day 9: Smoke Basin"
+
+    def parse_input(self, data):
+        return [[int(c) for c in r] for r in data.split()]
+
+    def solve(self, puzzle_input):
+        lp = 0
+        lpi = len(puzzle_input)
+        for v, row in enumerate(puzzle_input):
+            lr = len(row)
+            for i in range(lr):
+                x = row[i]
+                s1 = row[i - 1] if i > 0 else 11
+                s2 = row[i + 1] if i < lr - 1 else 11
+                s3 = puzzle_input[v - 1][i] if v > 0 else 11
+                s4 = puzzle_input[v + 1][i] if v < lpi - 1 else 11
+                if all(x < s for s in [s1, s2, s3, s4]):
+                    lp += 1 + x
+        return lp
+
+    def solve_again(self, puzzle_input):
+        return True
+
+
+if __name__ == "__main__":
+    solution = Solution()
+    solution.show_results()
diff --git a/2021-python/tests/test_day_09.py b/2021-python/tests/test_day_09.py
new file mode 100644
index 0000000..69e0225
--- /dev/null
+++ b/2021-python/tests/test_day_09.py
@@ -0,0 +1,37 @@
+import unittest
+
+from solutions.day_09 import Solution
+
+
+class Day09TestCase(unittest.TestCase):
+    def setUp(self):
+        self.solution = Solution()
+        self.puzzle_input = self.solution.parse_input(
+            """
+        2199943210
+3987894921
+9856789892
+8767896789
+9899965678
+        """
+        )
+
+    def test_parse_puzzle_input(self):
+        data = """
+        2199943210
+3987894921
+        """
+        assert self.solution.parse_input(data) == [
+            [2, 1, 9, 9, 9, 4, 3, 2, 1, 0],
+            [3, 9, 8, 7, 8, 9, 4, 9, 2, 1],
+        ]
+
+    def test_solve_first_part(self):
+        assert self.solution.solve(self.puzzle_input) == 15
+
+    # def test_solve_second_part(self):
+    #     assert self.solution.solve_again(self.puzzle_input) == True
+
+
+if __name__ == "__main__":
+    unittest.main()