diff --git a/test.py b/test.py
index 217edcb..1f780d1 100644
--- a/test.py
+++ b/test.py
@@ -199,6 +199,11 @@ class CurrentTime (GameObject):
                     (i % 2, i // 2 * 2))
 
 
+class Balloon (GameObject):
+    query:  str
+    answer: str
+
+
 class CWindow:
     WIDTH   = 1024
     HEIGHT  =  768