diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index 94cd39bc4c..33d2d4d446 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -72,6 +72,7 @@ use pocketmine\form\FormValidationException;
 use pocketmine\inventory\CraftingGrid;
 use pocketmine\inventory\Inventory;
 use pocketmine\inventory\PlayerCursorInventory;
+use pocketmine\inventory\PlayerUIInventory;
 use pocketmine\inventory\transaction\action\InventoryAction;
 use pocketmine\inventory\transaction\CraftingTransaction;
 use pocketmine\inventory\transaction\InventoryTransaction;
@@ -289,8 +290,8 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 	protected $windowIndex = [];
 	/** @var bool[] */
 	protected $permanentWindows = [];
-	/** @var PlayerCursorInventory */
-	protected $cursorInventory;
+	/** @var PlayerUIInventory */
+	protected $playerUIInventory;
 	/** @var CraftingGrid */
 	protected $craftingGrid = null;
 	/** @var CraftingTransaction|null */
@@ -2718,6 +2719,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 		if(!$this->spawned or !$this->isAlive()){
 			return true;
 		}
+
 		if($packet->action === InteractPacket::ACTION_MOUSEOVER and $packet->target === 0){
 			//TODO HACK: silence useless spam (MCPE 1.8)
 			//this packet is EXPECTED to only be sent when interacting with an entity, but due to some messy Mojang
@@ -3552,7 +3554,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 			$this->removeAllWindows(true);
 			$this->windows = [];
 			$this->windowIndex = [];
-			$this->cursorInventory = null;
+			$this->playerUIInventory = null;
 			$this->craftingGrid = null;
 
 			if($this->constructed){
@@ -3817,16 +3819,19 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 
 		$this->addWindow($this->getArmorInventory(), ContainerIds::ARMOR, true);
 
-		$this->cursorInventory = new PlayerCursorInventory($this);
-		$this->addWindow($this->cursorInventory, ContainerIds::CURSOR, true);
-
-		$this->craftingGrid = new CraftingGrid($this, CraftingGrid::SIZE_SMALL);
+		$this->playerUIInventory = new PlayerUIInventory($this);
+		$this->addWindow($this->playerUIInventory, ContainerIds::UI, true);
 
+		$this->craftingGrid = new CraftingGrid($this->playerUIInventory, CraftingGrid::SIZE_SMALL);
 		//TODO: more windows
 	}
 
+	public function getPlayerUIInventory() : PlayerUIInventory{
+		return $this->playerUIInventory;
+	}
+
 	public function getCursorInventory() : PlayerCursorInventory{
-		return $this->cursorInventory;
+		return $this->playerUIInventory->getCursorInventory();
 	}
 
 	public function getCraftingGrid() : CraftingGrid{
@@ -3842,7 +3847,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 
 	public function doCloseInventory() : void{
 		/** @var Inventory[] $inventories */
-		$inventories = [$this->craftingGrid, $this->cursorInventory];
+		$inventories = [$this->craftingGrid, $this->getCursorInventory()];
 		foreach($inventories as $inventory){
 			$contents = $inventory->getContents();
 			if(count($contents) > 0){
@@ -3856,7 +3861,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 		}
 
 		if($this->craftingGrid->getGridWidth() > CraftingGrid::SIZE_SMALL){
-			$this->craftingGrid = new CraftingGrid($this, CraftingGrid::SIZE_SMALL);
+			$this->craftingGrid = new CraftingGrid($this->playerUIInventory, CraftingGrid::SIZE_SMALL);
 		}
 	}
 
diff --git a/src/pocketmine/block/CraftingTable.php b/src/pocketmine/block/CraftingTable.php
index 05b52fd6ad..9e416e8725 100644
--- a/src/pocketmine/block/CraftingTable.php
+++ b/src/pocketmine/block/CraftingTable.php
@@ -49,7 +49,7 @@ class CraftingTable extends Solid{
 
 	public function onActivate(Item $item, Player $player = null) : bool{
 		if($player instanceof Player){
-			$player->setCraftingGrid(new CraftingGrid($player, CraftingGrid::SIZE_BIG));
+			$player->setCraftingGrid(new CraftingGrid($player->getPlayerUIInventory(), CraftingGrid::SIZE_BIG));
 		}
 
 		return true;
diff --git a/src/pocketmine/inventory/BaseUIInventory.php b/src/pocketmine/inventory/BaseUIInventory.php
new file mode 100644
index 0000000000..3636e3ab75
--- /dev/null
+++ b/src/pocketmine/inventory/BaseUIInventory.php
@@ -0,0 +1,116 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\inventory;
+
+use pocketmine\item\Item;
+use pocketmine\item\ItemFactory;
+use pocketmine\Player;
+
+class BaseUIInventory extends BaseInventory{
+
+	protected $inventory;
+	protected $size;
+	protected $offset;
+
+	public function __construct(PlayerUIInventory $inventory, int $size, int $offset){
+		$this->inventory = $inventory;
+		$this->size = $size;
+		$this->offset = $offset;
+		parent::__construct([], $size);
+	}
+
+	public function getName() : string{
+		return "UI";
+	}
+
+	public function getDefaultSize() : int{
+		return 1;
+	}
+
+	public function getSize() : int{
+		return $this->size;
+	}
+
+	public function getMaxStackSize() : int{
+		return Inventory::MAX_STACK;
+	}
+
+	public function setMaxStackSize(int $size) : void{
+	}
+
+	public function getTitle() : string{
+		return "";
+	}
+
+	public function getItem(int $index) : Item{
+		return $this->inventory->getItem($index + $this->offset);
+	}
+
+	public function setItem(int $index, Item $item, bool $send = true) : bool{
+		return $this->inventory->setItem($index + $this->offset, $item, $send);
+	}
+
+	public function getContents(bool $includeEmpty = false) : array{
+		$contents = [];
+		$air = null;
+		foreach($this->slots as $i => $slot){
+			if($i < $this->offset || $i > $this->offset + $this->size){
+				continue;
+			}
+			if($slot !== null){
+				$contents[$i] = clone $slot;
+			}elseif($includeEmpty){
+				$contents[$i] = $air ?? ($air = ItemFactory::get(Item::AIR, 0, 0));
+			}
+		}
+
+		return $contents;
+	}
+
+	public function sendContents($target) : void{
+		$this->inventory->sendContents($target);
+	}
+
+	public function sendSlot(int $index, $target) : void{
+		$this->inventory->sendSlot($index + $this->offset, $target);
+	}
+
+	public function getViewers() : array{
+		return $this->inventory->viewers;
+	}
+
+	public function onOpen(Player $who) : void{}
+
+	public function onClose(Player $who) : void{}
+
+	public function open(Player $who) : bool{
+		return false;
+	}
+
+	public function close(Player $who) : void{}
+
+	public function onSlotChange(int $index, Item $before, bool $send) : void{
+		$this->inventory->onSlotChange($index + $this->offset, $before, $send);
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/inventory/CraftingGrid.php b/src/pocketmine/inventory/CraftingGrid.php
index 4beb9ed71a..b54068f4e4 100644
--- a/src/pocketmine/inventory/CraftingGrid.php
+++ b/src/pocketmine/inventory/CraftingGrid.php
@@ -29,134 +29,23 @@ use function max;
 use function min;
 use const PHP_INT_MAX;
 
-class CraftingGrid extends BaseInventory{
-	public const SIZE_SMALL = 2;
-	public const SIZE_BIG = 3;
+class CraftingGrid extends BaseUIInventory{
+	public const SIZE_SMALL = 4;
+	public const SIZE_BIG = 9;
 
-	/** @var Player */
-	protected $holder;
 	/** @var int */
 	private $gridWidth;
 
-	/** @var int|null */
-	private $startX;
-	/** @var int|null */
-	private $xLen;
-	/** @var int|null */
-	private $startY;
-	/** @var int|null */
-	private $yLen;
-
-	public function __construct(Player $holder, int $gridWidth){
-		$this->holder = $holder;
+	public function __construct(PlayerUIInventory $inventory, int $gridWidth){
 		$this->gridWidth = $gridWidth;
-		parent::__construct();
+		if($gridWidth === self::SIZE_SMALL){
+			parent::__construct($inventory, $gridWidth, 28);
+		}elseif($gridWidth === self::SIZE_BIG){
+			parent::__construct($inventory, $gridWidth, 32);
+		}
 	}
 
 	public function getGridWidth() : int{
 		return $this->gridWidth;
 	}
-
-	public function getDefaultSize() : int{
-		return $this->getGridWidth() ** 2;
-	}
-
-	public function setSize(int $size){
-		throw new \BadMethodCallException("Cannot change the size of a crafting grid");
-	}
-
-	public function getName() : string{
-		return "Crafting";
-	}
-
-	public function setItem(int $index, Item $item, bool $send = true) : bool{
-		if(parent::setItem($index, $item, $send)){
-			$this->seekRecipeBounds();
-
-			return true;
-		}
-
-		return false;
-	}
-
-	public function sendSlot(int $index, $target) : void{
-		//we can't send a slot of a client-sided inventory window
-	}
-
-	public function sendContents($target) : void{
-		//no way to do this
-	}
-
-	/**
-	 * @return Player
-	 */
-	public function getHolder(){
-		return $this->holder;
-	}
-
-	private function seekRecipeBounds() : void{
-		$minX = PHP_INT_MAX;
-		$maxX = 0;
-
-		$minY = PHP_INT_MAX;
-		$maxY = 0;
-
-		$empty = true;
-
-		for($y = 0; $y < $this->gridWidth; ++$y){
-			for($x = 0; $x < $this->gridWidth; ++$x){
-				if(!$this->isSlotEmpty($y * $this->gridWidth + $x)){
-					$minX = min($minX, $x);
-					$maxX = max($maxX, $x);
-
-					$minY = min($minY, $y);
-					$maxY = max($maxY, $y);
-
-					$empty = false;
-				}
-			}
-		}
-
-		if(!$empty){
-			$this->startX = $minX;
-			$this->xLen = $maxX - $minX + 1;
-			$this->startY = $minY;
-			$this->yLen = $maxY - $minY + 1;
-		}else{
-			$this->startX = $this->xLen = $this->startY = $this->yLen = null;
-		}
-	}
-
-	/**
-	 * Returns the item at offset x,y, offset by where the starts of the recipe rectangle are.
-	 *
-	 * @param int $x
-	 * @param int $y
-	 *
-	 * @return Item
-	 */
-	public function getIngredient(int $x, int $y) : Item{
-		if($this->startX !== null and $this->startY !== null){
-			return $this->getItem(($y + $this->startY) * $this->gridWidth + ($x + $this->startX));
-		}
-
-		throw new \InvalidStateException("No ingredients found in grid");
-	}
-
-	/**
-	 * Returns the width of the recipe we're trying to craft, based on items currently in the grid.
-	 *
-	 * @return int
-	 */
-	public function getRecipeWidth() : int{
-		return $this->xLen ?? 0;
-	}
-
-	/**
-	 * Returns the height of the recipe we're trying to craft, based on items currently in the grid.
-	 * @return int
-	 */
-	public function getRecipeHeight() : int{
-		return $this->yLen ?? 0;
-	}
 }
diff --git a/src/pocketmine/inventory/PlayerCursorInventory.php b/src/pocketmine/inventory/PlayerCursorInventory.php
index b967139f5f..32939f7f76 100644
--- a/src/pocketmine/inventory/PlayerCursorInventory.php
+++ b/src/pocketmine/inventory/PlayerCursorInventory.php
@@ -23,34 +23,9 @@ declare(strict_types=1);
 
 namespace pocketmine\inventory;
 
-use pocketmine\Player;
+class PlayerCursorInventory extends BaseUIInventory{
 
-class PlayerCursorInventory extends BaseInventory{
-	/** @var Player */
-	protected $holder;
-
-	public function __construct(Player $holder){
-		$this->holder = $holder;
-		parent::__construct();
-	}
-
-	public function getName() : string{
-		return "Cursor";
-	}
-
-	public function getDefaultSize() : int{
-		return 1;
-	}
-
-	public function setSize(int $size){
-		throw new \BadMethodCallException("Cursor can only carry one item at a time");
-	}
-
-	/**
-	 * This override is here for documentation and code completion purposes only.
-	 * @return Player
-	 */
-	public function getHolder(){
-		return $this->holder;
+	public function __construct(PlayerUIInventory $inventory){
+		parent::__construct($inventory, 1, 0);
 	}
 }
diff --git a/src/pocketmine/inventory/PlayerUIInventory.php b/src/pocketmine/inventory/PlayerUIInventory.php
new file mode 100644
index 0000000000..a3e9e64542
--- /dev/null
+++ b/src/pocketmine/inventory/PlayerUIInventory.php
@@ -0,0 +1,89 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\inventory;
+
+use pocketmine\network\mcpe\protocol\InventorySlotPacket;
+use pocketmine\network\mcpe\protocol\types\ContainerIds;
+use pocketmine\Player;
+
+class PlayerUIInventory extends BaseInventory{
+	/** @var Player */
+	protected $holder;
+	/** @var int */
+	protected $size;
+	/** @var int */
+	protected $offset;
+	/** @var PlayerCursorInventory */
+	protected $cursorInventory;
+
+	public function __construct(Player $holder){
+		$this->holder = $holder;
+		$this->cursorInventory = new PlayerCursorInventory($this);
+		parent::__construct();
+	}
+
+	public function getCursorInventory(){
+		return $this->cursorInventory;
+	}
+
+	public function getName() : string{
+		return "UI";
+	}
+
+	public function getDefaultSize() : int{
+		return 51;
+	}
+
+	public function getSize() : int{
+		return 51;
+	}
+
+	public function getHolder(){
+		return $this->holder;
+	}
+
+	public function setSize(int $size){}
+
+	public function sendSlot(int $index, $target) : void{
+		if($target instanceof Player){
+			$target = [$target];
+		}
+		$pk = new InventorySlotPacket();
+		$pk->inventorySlot = $index;
+		$pk->item = $this->getItem($index);
+		foreach($target as $player){
+			if($player === $this->getHolder()){
+				$pk->windowId = ContainerIds::UI;
+				$player->dataPacket($pk);
+			}else{
+				if(($id = $player->getWindowId($this)) === ContainerIds::NONE){
+					$this->close($player);
+					continue;
+				}
+				$pk->windowId = $id;
+				$player->dataPacket($pk);
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/network/mcpe/protocol/types/ContainerIds.php b/src/pocketmine/network/mcpe/protocol/types/ContainerIds.php
index 3b55065e51..0c9769f9f0 100644
--- a/src/pocketmine/network/mcpe/protocol/types/ContainerIds.php
+++ b/src/pocketmine/network/mcpe/protocol/types/ContainerIds.php
@@ -34,6 +34,6 @@ interface ContainerIds{
 	public const CREATIVE = 121;
 	public const HOTBAR = 122;
 	public const FIXED_INVENTORY = 123;
-	public const CURSOR = 124;
+	public const UI = 124;
 
 }