===================================================================
--- original.js
+++ change.js
@@ -38,8 +38,11 @@
 	return self;
 });
 var ShiftContainer = ConfigContainer.expand(function (config) {
 	var self = ConfigContainer.call(this, config);
+	config = config || {};
+	self.shift = config.shift !== undefined ? config.shift : 1.0;
+	;
 	return self;
 });
 var Pickup = ConfigContainer.expand(function (config) {
 	var self = ConfigContainer.call(this, config);
@@ -420,19 +423,23 @@
 	var distance = 0;
 	var distanceMax = 0;
 	var hookSpawnDist = self.zoom = 1;
 	self.shift = function (x, y) {
+		// Shift all nested instances attached to the camera
 		for (var i = 0; i < self.children.length; i++) {
-			var childContainer = self.children[i];
-			for (var j = 0; j < childContainer.children.length; j++) {
-				var childInstance = childContainer.children[j];
-				childInstance.x -= x;
+			var shiftContainer = self.children[i];
+			var shiftX = shiftContainer.shift * x;
+			for (var j = 0; j < shiftContainer.children.length; j++) {
+				var childInstance = shiftContainer.children[j];
+				childInstance.x -= shiftX;
 			}
 		}
 		foreground.x -= x / FOREGROUND_MOVEMENT;
 		shadowground.x += x / SHADOWGROUND_MOVEMENT;
+		// Manually adjust the frog's position
 		frog.x += x;
 		frog.y += y;
+		// Keep track of the scoring
 		distance += x;
 		if (distance > distanceMax) {
 			gameInterface.increaseDistance(distance - distanceMax);
 			distanceMax = distance;