diff --git a/src/tilemaps/components/RunCull.js b/src/tilemaps/components/RunCull.js
new file mode 100644
index 000000000..b35ca61df
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+++ b/src/tilemaps/components/RunCull.js
@@ -0,0 +1,120 @@
+/**
+ * @author       Richard Davey <rich@photonstorm.com>
+ * @copyright    2020 Photon Storm Ltd.
+ * @license      {@link https://opensource.org/licenses/MIT|MIT License}
+ */
+
+/**
+ * Returns the tiles in the given layer that are within the cameras viewport. This is used internally.
+ *
+ * @function Phaser.Tilemaps.Components.RunCull
+ * @since 3.50.0
+ *
+ * @param {Phaser.Tilemaps.LayerData} layer - The Tilemap Layer to act upon.
+ * @param {object} bounds - An object containing the `left`, `right`, `top` and `bottom` bounds.
+ * @param {integer} renderOrder - The rendering order constant.
+ * @param {array} outputArray - The array to store the Tile objects within.
+ *
+ * @return {Phaser.Tilemaps.Tile[]} An array of Tile objects.
+ */
+var RunCull = function (layer, bounds, renderOrder, outputArray)
+{
+    var mapData = layer.data;
+    var mapWidth = layer.width;
+    var mapHeight = layer.height;
+
+    var tilemapLayer = layer.tilemapLayer;
+
+    var drawLeft = Math.max(0, bounds.left);
+    var drawRight = Math.min(mapWidth, bounds.right);
+    var drawTop = Math.max(0, bounds.top);
+    var drawBottom = Math.min(mapHeight, bounds.bottom);
+
+    var x;
+    var y;
+    var tile;
+
+    if (renderOrder === 0)
+    {
+        //  right-down
+
+        for (y = drawTop; y < drawBottom; y++)
+        {
+            for (x = drawLeft; mapData[y] && x < drawRight; x++)
+            {
+                tile = mapData[y][x];
+
+                if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
+                {
+                    continue;
+                }
+
+                outputArray.push(tile);
+            }
+        }
+    }
+    else if (renderOrder === 1)
+    {
+        //  left-down
+
+        for (y = drawTop; y < drawBottom; y++)
+        {
+            for (x = drawRight; mapData[y] && x >= drawLeft; x--)
+            {
+                tile = mapData[y][x];
+
+                if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
+                {
+                    continue;
+                }
+
+                outputArray.push(tile);
+            }
+        }
+    }
+    else if (renderOrder === 2)
+    {
+        //  right-up
+
+        for (y = drawBottom; y >= drawTop; y--)
+        {
+            for (x = drawLeft; mapData[y] && x < drawRight; x++)
+            {
+                tile = mapData[y][x];
+
+                if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
+                {
+                    continue;
+                }
+
+                outputArray.push(tile);
+            }
+        }
+    }
+    else if (renderOrder === 3)
+    {
+        //  left-up
+
+        for (y = drawBottom; y >= drawTop; y--)
+        {
+            for (x = drawRight; mapData[y] && x >= drawLeft; x--)
+            {
+                tile = mapData[y][x];
+
+                if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
+                {
+                    continue;
+                }
+
+                outputArray.push(tile);
+            }
+        }
+    }
+
+    tilemapLayer.tilesDrawn = outputArray.length;
+    tilemapLayer.tilesTotal = mapWidth * mapHeight;
+
+    return outputArray;
+};
+
+module.exports = RunCull;