diff --git a/source/room.cpp b/source/room.cpp
index 12364d1..59187d9 100644
--- a/source/room.cpp
+++ b/source/room.cpp
@@ -778,19 +778,28 @@ void Room::setBottomSurfaces()
 
     // Recorre el vector de tiles buscando tiles consecutivos para localizar las superficies
     int i = 0;
+    int lastOne = 0;
     while (i < tile.size())
     {
         h_line_t line;
         line.x1 = (tile[i] % mapWidth) * tileSize;
         line.y = ((tile[i] / mapWidth) * tileSize) + tileSize - 1;
+        lastOne = i;
+        i++;
 
-        while (tile[i] + 1 == tile[i + 1])
+        while (tile[i] == tile[i - 1] + 1)
         {
+            lastOne = i;
             i++;
         }
-        line.x2 = ((tile[i] % mapWidth) * tileSize) + tileSize - 1;
+
+        line.x2 = ((tile[lastOne] % mapWidth) * tileSize) + tileSize - 1;
         bottomSurfaces.push_back(line);
-        i++;
+        if (tile[i] == -1)
+        { // Si el siguiente elemento es un separador, hay que saltarlo
+            i++;
+        }
+
         debug->addToLog("B: " + std::to_string(line.x1) + "," + std::to_string(line.y) + "," + std::to_string(line.x2) + "," + std::to_string(line.y));
     }
 }
@@ -820,18 +829,27 @@ void Room::setTopSurfaces()
 
     // Recorre el vector de tiles buscando tiles consecutivos para localizar las superficies
     int i = 0;
+    int lastOne = 0;
     while (i < tile.size())
     {
         h_line_t line;
         line.x1 = (tile[i] % mapWidth) * tileSize;
         line.y = (tile[i] / mapWidth) * tileSize;
-        while (tile[i] + 1 == tile[i + 1])
+        lastOne = i;
+        i++;
+
+        while (tile[i] == tile[i - 1] + 1)
         {
+            lastOne = i;
             i++;
         }
-        line.x2 = ((tile[i] % mapWidth) * tileSize) + tileSize - 1;
+
+        line.x2 = ((tile[lastOne] % mapWidth) * tileSize) + tileSize - 1;
         topSurfaces.push_back(line);
-        i++;
+        if (tile[i] == -1)
+        { // Si el siguiente elemento es un separador, hay que saltarlo
+            i++;
+        }
 
         debug->addToLog("T: " + std::to_string(line.x1) + "," + std::to_string(line.y) + "," + std::to_string(line.x2) + "," + std::to_string(line.y));
     }
@@ -909,7 +927,6 @@ void Room::setRightSurfaces()
         }
         line.y2 = ((tile[i] / mapWidth) * tileSize) + tileSize - 1;
         rightSurfaces.push_back(line);
-
         i++;
     }
 }