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diff --git a/06/main.py b/06/main.py
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+#!/usr/bin/python
+
+import numpy as np
+
+
+
+def solve_partn(partn, lines):
+    # In part 1, we treat an int32 as a boolean: 1 = True, 0 = False
+    grid = np.zeros((1000, 1000), dtype="int32")
+
+    for line in lines:
+        words = line.split()
+        if words[0] == "turn":
+            xi, yi = [int(n) for n in words[2].split(",")]
+            xf, yf = [int(n) + 1 for n in words[4].split(",")]
+
+            if partn == 1:
+                if words[1] == "on":
+                    grid[xi : xf, yi : yf] = 1
+                elif words[1] == "off":
+                    grid[xi : xf, yi : yf] = 0
+            else: # partn == 2
+                if words[1] == "on":
+                    grid[xi : xf, yi : yf] += 1
+                elif words[1] == "off":
+                    grid[xi : xf, yi : yf] -= 1
+                    grid = np.clip(grid, 0, 1000000)
+
+        elif words[0] == "toggle":
+            xi, yi = [int(n) for n in words[1].split(",")]
+            xf, yf = [int(n) + 1 for n in words[3].split(",")]
+
+            if partn == 1:
+                grid[xi : xf, yi : yf] = 1 - grid[xi : xf, yi : yf] # NOT
+            else: # partn == 2
+                grid[xi : xf, yi : yf] += 2
+
+    return np.sum(grid)
+
+
+
+def main():
+    # Read instructions from input text file
+    with open("input.txt", "r") as f:
+        lines = f.read().splitlines()
+
+    print("Part 1 solution:", solve_partn(1, lines)) #   400410 for me
+    print("Part 2 solution:", solve_partn(2, lines)) # 15343601 for me
+
+
+
+if __name__ == "__main__":
+    main()