diff --git a/MapBuilderForWeb/BuilderCalculations.js b/MapBuilderForWeb/BuilderCalculations.js
index c485aac..e8bda2b 100644
--- a/MapBuilderForWeb/BuilderCalculations.js
+++ b/MapBuilderForWeb/BuilderCalculations.js
@@ -152,7 +152,22 @@
 		   
 		   return minValue;
 	   }
-	   
+
+	   	function GetMinValues(coordenates){
+		let minValue = {x:999, y:999};
+		
+		for( let i=0; i<coordenates.x.length; i++ ){
+			if(coordenates.x[i] < minValue.x){
+				minValue.x = coordenates.x[i];
+			}
+			if(coordenates.y[i] < minValue.y){
+				minValue.y = coordenates.y[i];
+			}
+		}
+		
+		return minValue;
+		}
+
 	   function GetMaxValuesOfCoordenates(coordenates){
 		   let maxValue = {x:0, y:0};
 		   
diff --git a/MapBuilderForWeb/MapBuilder.js b/MapBuilderForWeb/MapBuilder.js
index 56a8d95..4e4596e 100644
--- a/MapBuilderForWeb/MapBuilder.js
+++ b/MapBuilderForWeb/MapBuilder.js
@@ -295,7 +295,7 @@ function ItemPlacingInfo(itemType, rotation, positionX, positionY, coordenates,
 		this.positionX = 0;
 		this.positionY = 0;
 		this.coordenates = new Vector2Array();
-		this.level = {x:0, y:0};
+		this.level = new Point();
 	
 		//Internal properties
 		this.indexInHistory = 0;
@@ -326,11 +326,10 @@ function OutputData(){
 	this.mapSizeX = 0;
 	this.mapSizeY = 0;
 	this.mapName = "unnamed";
+	this.parseInfo = {originalSize:null, originalOffset:null, level:null, rows:null, cols:null};
 
     this.generateFromHistory = function( history=historyOfPlacements ){
 		
-		//if(history == null) history = ;
-		
 		let numberOfInstructions = history.length;
 		this.itemTypes = [];
 		this.itemRotations = [];
@@ -439,32 +438,59 @@ function Point(x, y){
 	}
 
 	function uploadMaps(mapsString){
+
 		let maps = [];
-		let mapSize;
+		maps[0] = JSON.parse(mapsString[0]);
 
-		// Simplified version with a non cutted map
-		if(mapsString.length == 1){
-			maps = JSON.parse(mapsString[0]);
-			updateMap(maps);
-			return;
-		}
+		//Rebuild from parseInfo data
+		let newMapSizeX = maps[0].parseInfo.originalSize.x;
+		let newMapSizeY = maps[0].parseInfo.originalSize.y;
+		let nrows = maps[0].parseInfo.rows;
+		let ncols = maps[0].parseInfo.cols;
 
-		// First parse all
-		let nmaps = mapsString.length;
-		for(let i=0; i<nmaps; i++){
+		MapRowCols(newMapSizeX, newMapSizeY, nrows, ncols);
+		updateMap(maps[0]);
+
+		//Build each map
+		for(let i=1; i<mapsString.length; i++){
 			maps[i] = JSON.parse(mapsString[i]);
+			updateMap(maps[i]);
 		}
 
 
 	}
 
-	function updateMap(maps){
-		map(maps.mapSizeX, maps.mapSizeY);
+	function updateMap(maps){	
+		//Rebuild from parseInfo data
+		currentItemPlacingInfo.level = maps.parseInfo.level;
+
+		let placementOffset = new Point(0,0);
+		if( maps.parseInfo.originalOffset != null ){
+			placementOffset.x = maps.parseInfo.originalOffset.minX;
+			placementOffset.y = maps.parseInfo.originalOffset.minY;
+		}
 
 		for(let i=0; i<maps.positionsX.length; i++){
-			ChangeItem(maps.itemTypes[i]);
+
 			currentItemPlacingInfo.rotation = maps.itemRotations[i];
-			OnGridClick(maps.positionsX[i], maps.positionsY[i]);
+			currentItemPlacingInfo.itemType = maps.itemTypes[i];
+
+			let itemType = maps.itemTypes[i];
+			let itemShape = listOfShapes[itemType];
+			let shapeRotated = RotateCoordenatesByAngle(itemShape, currentItemPlacingInfo.rotation);
+
+			//Performs a global rotation. Switches axis and mirrors Y
+			currentItemPlacingInfo.positionX = (maps.mapSizeY-1) - maps.positionsY[i] + placementOffset.x;
+			currentItemPlacingInfo.positionY = maps.positionsX[i] + placementOffset.y;
+
+			let pivot = GetMinValuesOfCoordenates(shapeRotated);
+			let coordenates = GlobalizeCoordenates(shapeRotated, currentItemPlacingInfo.positionX - pivot.x, currentItemPlacingInfo.positionY - pivot.y);
+			currentItemPlacingInfo.coordenates = coordenates;
+
+			//console.log( new ItemPlacingInfo(currentItemPlacingInfo) )
+			printVisualsOfCoordenates(coordenates, listOfShapeColors[ maps.itemTypes[i] ]);
+			UpdateOccupancy(coordenates, OCCUPIED);
+			RegisterHistoryOfPlacements(currentItemPlacingInfo);
 		}
 	}
 
diff --git a/MapBuilderForWeb/MapBuilderForWeb.html b/MapBuilderForWeb/MapBuilderForWeb.html
index d8d2042..d909eb7 100644
--- a/MapBuilderForWeb/MapBuilderForWeb.html
+++ b/MapBuilderForWeb/MapBuilderForWeb.html
@@ -143,6 +143,7 @@
 				
 					if( levels[r] == null ) levels[r] = new Array();
 					levels[r][c] = level;
+
 				}
 			}
 
@@ -276,8 +277,8 @@
 
 		function ResetOccupancyMap(){
 
-			for (let r=0; r<gridRows; r++) {
-				for (let c=0; c<gridCols; c++) {
+			for (let r=0; r<occupancyMaps.length; r++) {
+				for (let c=0; c<occupancyMaps[0].length; c++) {
 					let occupancyMap = occupancyMaps[r][c];
 					let level = levels[r][c];
 					let formatedCoordenates = OccupancyMapToCoordenates(occupancyMap);
diff --git a/MapBuilderForWeb/MultimapMechanics.js b/MapBuilderForWeb/MultimapMechanics.js
index 29d387f..d192a95 100644
--- a/MapBuilderForWeb/MultimapMechanics.js
+++ b/MapBuilderForWeb/MultimapMechanics.js
@@ -1,16 +1,18 @@
 
 
-	function resetMap(){
+	function clearMap(){
 		if( AskForReset() == DONT_RESET ) return;
 
+		ResetMap();
 		if(gridMap != null){
 			document.getElementById("GridGraphics").removeChild(gridMap);
 			gridMap = null;
 		}
+		//console.log("clearMap");
 	}
 
 	function map(x, y){
-		resetMap()
+		clearMap();
 
 		gridSize.x =  Math.max(1, x);
 		gridSize.y =  Math.max(1, y);
@@ -27,10 +29,20 @@
 		map(gridSize.x, gridSize.y);
 	}
 
+	function MapRowCols(x, y, nrows, ncols){
+		clearMap();
+
+		gridCols = Math.max(1, ncols);
+		gridRows = Math.max(1, nrows);
+		gridSize.x =  Math.max(1, x);
+		gridSize.y =  Math.max(1, y);
+		initializeMapEditorGrid( gridSize.x, gridSize.y );
+	}
+
 	const RESET = true;
 	const DONT_RESET = false;
 	function AskForReset(message=""){
-		for(let r=0; r<occupancyMaps.length; r++){
+		/*for(let r=0; r<occupancyMaps.length; r++){
 			for(let c=0; c<occupancyMaps[0].length; c++){
 				
 				let coordenates = OccupancyMapToCoordenates(occupancyMaps[r][c]);
@@ -41,7 +53,8 @@
 					return DONT_RESET;
 				}
 			}
-		}
+		}*/
+		//console.log("AskForReset");
 		return RESET;
 	}
 
@@ -106,8 +119,9 @@
 				
 				//Localized coordenates are just the minimum size in which the whole level fits
 				let rotatedCoordenates;
+				let residueData;
 				if(localize){
-					let data = outputData[r][c].generateFromMap( occupancyMaps[r][c] );
+					residueData = outputData[r][c].generateFromMap( occupancyMaps[r][c] );
 					
 					//Rotates in local space
 					rotatedCoordenates = LocalizeCoordenates(formatedCoordenates);
@@ -121,7 +135,14 @@
 					outputData[r][c].mapSizeX = gridSize.y;
 					outputData[r][c].mapSizeY = gridSize.x;
 				}
-				
+
+				//Data that can be used to upload and rebuild the session
+				outputData[r][c].parseInfo.originalSize = gridSize;
+				outputData[r][c].parseInfo.originalOffset = residueData;
+				outputData[r][c].parseInfo.level = new Point(r,c);
+				outputData[r][c].parseInfo.rows = gridRows;
+				outputData[r][c].parseInfo.cols = gridCols;
+
 				//Coordenates are formated and sent back to output data
 				outputData[r][c].positionsX = rotatedCoordenates.x;
 				outputData[r][c].positionsY = rotatedCoordenates.y;