diff --git a/lib/demo/bowling.lua b/lib/demo/bowling.lua
index 39d876b..23d7bd5 100644
--- a/lib/demo/bowling.lua
+++ b/lib/demo/bowling.lua
@@ -72,14 +72,41 @@ function init_event()
     resetPins()
     setupStars()
     setupScore()
-    ag.setCamera(0, -10, 5, 0, 20, 0)
+    position_x = 0
+    target_x = 0
     game_state = "waiting"
+    last_update_time = ag.elapsedTime()
 end
 
 function update_event()
+    ag.setCamera(position_x, -10, 5, target_x, 20, 0)
+    local now = ag.elapsedTime()
+    if (ag.isKeyDown("a") or ag.isKeyDown("left")) then
+        position_x = position_x - (now - last_update_time) / 300
+        if (position_x < -2) then
+            position_x = -2
+        end
+    end
+    if (ag.isKeyDown("d") or ag.isKeyDown("right")) then
+        position_x = position_x + (now - last_update_time) / 300
+        if (position_x > 2) then
+            position_x = 2
+        end
+    end
+    last_update_time = now
+
     ag.callList(stars)
 end
 
+function mouse_motion_event(x, y, xrel, yrel)
+    target_x = target_x + xrel / 100
+    if (target_x < -2) then
+        target_x = -2
+    elseif (target_x > 2) then
+        target_x = 2
+    end
+end
+
 function drawFrameScore(width, height, frame, fs)
     local size = 60
     local ball_size = 24
@@ -146,6 +173,8 @@ end
 function launchBall()
     game_state = "launched"
     launch_time = ag.elapsedTime()
+    bowling_ball = reference_ball:clone()
+    bowling_ball:setPosition(position_x, -10, 4)
 end
 
 function drawPowerBar(width, height)