diff --git a/03_map.py b/03_map.py
index c8c100d..aa0b8d2 100644
--- a/03_map.py
+++ b/03_map.py
@@ -263,7 +263,10 @@ def on_draw():
 
 
 # init random
-seed = random.randint(0, sys.maxsize)
+if len(sys.argv) > 1:
+    seed = int(sys.argv[1])
+else:
+    seed = random.randint(0, sys.maxsize)
 print("Using seed: " + str(seed))
 random.seed(seed)