diff --git a/maps/base.gmf9 b/maps/base.gmf9
index 6b6ee5b..2fa9cad 100644
--- a/maps/base.gmf9
+++ b/maps/base.gmf9
@@ -1,9 +1,13 @@
 // Copyright © 2017 Project Golan, all rights reserved.
 {0 Player -200  250 16}
-{0 Sector -450 -330 510 660 0  96} // center
-{0 Sector -450 -355 510  25 64 96} // top
-{0 Sector -450  330 510  25 64 96} // bottom
-{0 Sector -475 -355 25  710 64 96} // left
-{0 Sector   60 -355 25  710 64 96} // right
+{0 Sector -450 -330 510 660 0 96} // center
+{0 Sector -450 -355 510  25 1 96} // top-blocker
+{0 Sector -450 -380 510  25 0 0 } // top-wall
+{0 Sector -450  330 510  25 1 96} // bottom-blocker
+{0 Sector -450  355 510  25 0 0 } // bottom-wall
+{0 Sector -475 -355  25 710 1 96} // left-blocker
+{0 Sector -500 -355  25 710 0 0 } // left-wall
+{0 Sector   60 -355  25 710 1 96} // right-blocker
+{0 Sector   85 -355  25 710 0 0 } // right-wall
 
 // EOF