diff --git a/main.py b/main.py
index a3b5ef0..0c3edc5 100755
--- a/main.py
+++ b/main.py
@@ -2,7 +2,7 @@
 try:
     from numpy import complex256
 except ImportError:
-    from numpy import complex128 as complex256 
+    from numpy import complex128 as complex256
     print("Warning! Cannot use full precision!")
 
 from time import time_ns, sleep
@@ -88,12 +88,22 @@ def renderDebugInfo(gPlayer, clock, fontSize = 18):
 
     return fps_surf, cPos_surf, cRot_surf
 
+def make_wall(wall_buffer):
+    if (len(wall_buffer) != 2):
+        print('Warning: wall buffer not contains 2 points.')
+        return
+
+    level.append(
+        Segment(True, wall_buffer[0], wall_buffer[1], (23,74,183))
+    )
+
 def mainLoop():
     gPlayer = GyroVector(0,1)
     display = pygame.display.set_mode((1280,720))
     clock = pygame.time.Clock()
     fontSize = 18
     debugInfo = True
+    wall_buffer = []
 
     while True:
         #framestart = time_ns()
@@ -106,6 +116,14 @@ def mainLoop():
                     gPlayer.cRot *= -1
                 if event.key == pygame.K_F3:
                     debugInfo = not debugInfo
+                if event.key == pygame.K_F2:
+                    if (len(wall_buffer) == 1):
+                        wall_buffer.append(gPlayer.cPos)
+                        make_wall(wall_buffer)
+                        wall_buffer.clear()
+                    else:
+                        wall_buffer.append(gPlayer.cPos)
+
         keys = pygame.key.get_pressed()
         if keys[pygame.K_d]:
             gPlayer.rotate(ROT)
@@ -118,7 +136,7 @@ def mainLoop():
 
         display.fill(WHITE)
         #pygame.draw.rect(display,BLACK, c_tr(Poincare2Klein(gPlayer.cPos) * -100) + (100,100),0)
-        drawn = draw(level,gPlayer,PI/4,320)
+        drawn = draw(level,gPlayer,PI/2,320)
         pygame.draw.rect(display,SKY,    (0,0,1280,360))
         pygame.draw.rect(display,GROUND, (0,360,1280,360))
         n = 0