diff --git a/godot/addons/collections/int_range.gd b/godot/addons/collections/int_range.gd
index 2cd3166..021d90e 100644
--- a/godot/addons/collections/int_range.gd
+++ b/godot/addons/collections/int_range.gd
@@ -1,17 +1,26 @@
 class_name IntRange extends RefCounted
 
+static var Zero = IntRange.new(0, 0)
+
 var minmax: PackedInt32Array
 
 var min: int:
     get: return minmax[0]
 
 var max: int:
-    get: return minmax[1]
+    get:
+        if inclusive: return minmax[1] + 1
+        else: return minmax[1]
 
-static var Zero = IntRange.new(0, 0)
+var inclusive: bool
 
 func _init(start: int, end: int, inclusive: bool = false) -> void:
-    minmax = PackedInt32Array([start, end if not inclusive else end + 1])
+    minmax = PackedInt32Array([start, end])
+    self.inclusive = inclusive
+
+func _to_string() -> String:
+    var ch = "]" if inclusive else ")"
+    return "IntRange [%s, %s%s" % [min, max, ch]
 
 func length() -> int:
     return absi(max - min)
@@ -20,16 +29,16 @@ func is_zero() -> bool:
     return min == 0 and max == 0
 
 func is_empty() -> bool:
-    return is_zero()
+    return length() == 0
 
 func iter(step: int = 1) -> RangeIterator:
     return RangeIterator.new(self, min, step)
 
 func clamp(value: int) -> int:
-    return clampi(value, min, max)
+    return clampi(value, minmax[0], minmax[1])
 
 func wrap(value: int) -> int:
-    return wrapi(value, min, max)
+    return wrapi(value, minmax[0], minmax[1])
 
 func contains(value: int) -> bool:
     return value >= min and value < max
diff --git a/godot/addons/iterator/bounded_range.gd b/godot/addons/iterator/bounded_range.gd
index 8895385..540d8a8 100644
--- a/godot/addons/iterator/bounded_range.gd
+++ b/godot/addons/iterator/bounded_range.gd
@@ -1,29 +1,35 @@
 class_name BoundedRangeIterator extends Iterator
 
-var range: IntRange
-var bounds: IntRange
-var step: int
-var limit: int
-var index: int
+var _range: IntRange
+var _bounds: IntRange
+var _count: int
+var _step: int
+var _items_yielded: int = 0
 
-func _init(range: IntRange, bounds: IntRange, step: int = 1, limit: int = 1, start_index: int = range.min) -> void:
-    self.range = range
-    self.bounds = bounds
-    self.step = step
-    self.limit = limit
-    self.index = start_index
+func _init(range: IntRange, bounds: IntRange, step: int = 1) -> void:
+    self._range = range
+    self._count = range.length()
+    self._bounds = bounds
+    self._step = step
+
+static func from_array(xs: Array, iteration_range: IntRange, step: int = 1) -> BoundedRangeIterator:
+    return BoundedRangeIterator.new(iteration_range, IntRange.new(0, len(xs)), step)
+
+func _to_string() -> String:
+    return "BoundedRangeIterator { range: %s, count: %s, bounds: %s, step: %s, items_yielded: %s }" % \
+           [_range, _count, _bounds, _step, _items_yielded]
 
 func clone() -> BoundedRangeIterator:
-    return BoundedRangeIterator.new(range, bounds, step, limit, index)
+    var iter = BoundedRangeIterator.new(_range, _bounds, _step)
+    iter._items_yielded = _items_yielded
+    return iter
 
 func next() -> Option:
-    if bounds.contains(index):
-        var current_value = Option.some(index)
-        index += step
-        return current_value
-    elif limit > 0:
-        limit -= 1
-        var current_value = bounds.wrap(index)
-        index = current_value + 1
-        return Option.some(current_value)
-    else: return Option.none
+    if _items_yielded >= _count:
+        return Option.none
+
+    var index = _range.min + (_items_yielded * _step)
+    var wrapped_index = _bounds.wrap(index)
+    _items_yielded += 1
+
+    return Option.some(wrapped_index)
diff --git a/godot/addons/iterator/iterator.gd b/godot/addons/iterator/iterator.gd
index cbe0947..bcdf8e2 100644
--- a/godot/addons/iterator/iterator.gd
+++ b/godot/addons/iterator/iterator.gd
@@ -1,5 +1,8 @@
 class_name Iterator extends RefCounted
 
+func _to_string() -> String:
+    return "Iterator"
+
 func clone() -> Iterator:
     assert(false, "can't clone a abstract base class")
     return null
diff --git a/godot/addons/iterator/range.gd b/godot/addons/iterator/range.gd
index 424cbc5..5effb90 100644
--- a/godot/addons/iterator/range.gd
+++ b/godot/addons/iterator/range.gd
@@ -4,6 +4,7 @@ var index: int
 var range: IntRange
 var step: int
 var descending: bool
+var _done: bool = false
 
 func _init(range: IntRange, start_index: int = range.min, step: int = 1) -> void:
     assert(step != 0, "step cannot be zero")
@@ -23,8 +24,12 @@ func clone() -> RangeIterator:
     return RangeIterator.new(range, index)
 
 func next() -> Option:
-    if range.contains(index):
-        var current_value = Option.some(index)
-        index += step
-        return current_value
-    else: return Option.none
+    if _done: return Option.none
+    if index == range.max or not range.contains(index):
+        _done = true
+        if range.inclusive: return Option.some(index)
+        else: return Option.none
+
+    var current_value = Option.some(index)
+    index += step
+    return current_value
diff --git a/godot/addons/monads/option.gd b/godot/addons/monads/option.gd
index eb43dcb..6b5815a 100644
--- a/godot/addons/monads/option.gd
+++ b/godot/addons/monads/option.gd
@@ -7,6 +7,11 @@ static func some(value: Variant) -> Option:
 
 static var none: Option.None = None.new()
 
+static func from(value: Variant) -> Option:
+    if typeof(value) == TYPE_NIL:
+        return Option.none
+    else: return Option.some(value)
+
 static func collect_some(options: Array[Option], ignore_none: bool = false) -> Option:
     var result = []
     for option in options:
diff --git a/godot/addons/utils/utils.gd b/godot/addons/utils/utils.gd
new file mode 100644
index 0000000..2a846bc
--- /dev/null
+++ b/godot/addons/utils/utils.gd
@@ -0,0 +1,28 @@
+class_name Utils
+
+static func get_class_name(value: Object) -> String:
+    match value.get_script():
+        var script:
+            match script.get_global_name():
+                var name: return name
+                _: return script.get_instance_base_type()
+        _: return value.get_class()
+
+static func is_string_like(value: Variant) -> bool:
+    match typeof(value):
+        TYPE_STRING: return true
+        TYPE_STRING_NAME: return true
+        TYPE_NODE_PATH: return true
+        _: return false
+
+static func to_str(value: Variant) -> String:
+    match typeof(value):
+        TYPE_OBJECT:
+            if value.has_method('_to_string'):
+                return value.to_string()
+            else:
+                var name = get_class_name(value)
+                value = value as Object
+                var props: Dictionary = inst_to_dict(value)
+                return "%s %s" % [name, to_str(props)]
+        _: return str(value)
diff --git a/godot/scenes/inventory.tscn b/godot/scenes/inventory.tscn
index 90fe8cf..e7c480e 100644
--- a/godot/scenes/inventory.tscn
+++ b/godot/scenes/inventory.tscn
@@ -17,7 +17,6 @@ script = ExtResource("1_qw0r6")
 action = "inventory"
 
 [node name="ColorRect" type="ColorRect" parent="."]
-visible = false
 layout_mode = 1
 anchors_preset = 15
 anchor_right = 1.0
@@ -43,18 +42,6 @@ layout_mode = 2
 script = ExtResource("4_yyk2a")
 item_scene = ExtResource("5_uae8j")
 
-[node name="Item" parent="VBoxContainer/HItemList" instance=ExtResource("5_uae8j")]
-layout_mode = 2
-
-[node name="Item2" parent="VBoxContainer/HItemList" instance=ExtResource("5_uae8j")]
-layout_mode = 2
-
-[node name="Item3" parent="VBoxContainer/HItemList" instance=ExtResource("5_uae8j")]
-layout_mode = 2
-
-[node name="Item4" parent="VBoxContainer/HItemList" instance=ExtResource("5_uae8j")]
-layout_mode = 2
-
 [node name="Details" type="HBoxContainer" parent="VBoxContainer"]
 layout_mode = 2
 
diff --git a/godot/scenes/inventory_item.tscn b/godot/scenes/inventory_item.tscn
index 2d7ddfd..22a88cc 100644
--- a/godot/scenes/inventory_item.tscn
+++ b/godot/scenes/inventory_item.tscn
@@ -1,7 +1,9 @@
 [gd_scene load_steps=3 format=3 uid="uid://gn8k2ir47n1m"]
 
 [ext_resource type="Script" uid="uid://dt67n4jti376d" path="res://src/item_ui.gd" id="1_letey"]
-[ext_resource type="Texture2D" uid="uid://djmxd4580q6xs" path="res://icon.svg" id="2_y87vu"]
+
+[sub_resource type="PlaceholderTexture2D" id="PlaceholderTexture2D_u4rwp"]
+size = Vector2(128, 128)
 
 [node name="Item" type="BoxContainer" node_paths=PackedStringArray("name_label", "icon_texture")]
 offset_right = 128.0
@@ -18,8 +20,8 @@ layout_mode = 2
 
 [node name="Name" type="Label" parent="VBoxContainer"]
 layout_mode = 2
-text = "Test Item"
+text = "Empty"
 
 [node name="Icon" type="TextureRect" parent="VBoxContainer"]
 layout_mode = 2
-texture = ExtResource("2_y87vu")
+texture = SubResource("PlaceholderTexture2D_u4rwp")
diff --git a/godot/src/h_item_list.gd b/godot/src/h_item_list.gd
index 1aee577..3455369 100644
--- a/godot/src/h_item_list.gd
+++ b/godot/src/h_item_list.gd
@@ -11,8 +11,8 @@ var bind_item: Callable = _bind_item
 var ring_buffer: RingBuffer
 
 func _ready() -> void:
-    ring_buffer = RingBuffer.new(items.size(), buffer_size, 1, -buffered_items)
-    ring_buffer.updated.connect(_on_updated)
+    ring_buffer = RingBuffer.new(items.size(), buffer_size, buffer_size - 1)
+    ring_buffer.rotated.connect(_on_rotated)
 
     for _i in range(buffer_size):
         add_child(create_item.call())
@@ -30,21 +30,35 @@ func _hide_buffered_items():
 func _create_item() -> Node:
     return item_scene.instantiate()
 
-func _bind_item(node: Node, item: Item):
+func _bind_item(node: Node, item: Option):
     if node.has_method('bind'):
         node.call('bind', item)
 
-func _on_updated(_current_range: IntRange, _previous_range: IntRange):
+func _on_rotated(_direction: int):
     _update_display()
 
-func _update_display():
-    var indices: Array = ring_buffer.range().collect()
+func _get_item(index: int) -> Option:
+    if index < 0 or index >= len(items):
+        return Option.none
+    return Option.from(items[index])
 
-    for i in range(min(indices.size(), max_items)):
+func _update_display():
+    var iter = ring_buffer.iter()
+    var indices = iter.collect()
+
+    for i in range(buffer_size):
         var node = get_child(i)
-        var item = items[indices[i]]
-        if item != null:
-            bind_item.call(node, item)
+        var item_index_from_ring_buffer = indices[i]
+        var item_option = _get_item(item_index_from_ring_buffer)
+        bind_item.call(node, item_option)
+
+        #if item_option.is_none():
+        #    node.hide() # Hide if no item available
+        #else:
+        #    if i >= buffered_items and i < (buffer_size - buffered_items):
+        #        node.show()
+        #    else:
+        #        node.hide()
 
 func add_item(item: Variant):
     items.append(item)
@@ -55,3 +69,9 @@ func add_items(new_items: Array):
     items.append_array(new_items)
     ring_buffer.source_size = items.size()
     _update_display()
+
+func move_right():
+    ring_buffer.move_right()
+
+func move_left():
+    ring_buffer.move_left()
diff --git a/godot/src/item_ui.gd b/godot/src/item_ui.gd
index df671a3..6a2f68a 100644
--- a/godot/src/item_ui.gd
+++ b/godot/src/item_ui.gd
@@ -3,6 +3,21 @@ class_name ItemUI extends Control
 @export var name_label: Label
 @export var icon_texture: TextureRect
 
-func bind(item: Item):
-    name_label.text = item.name
-    icon_texture.texture = item.icon
+var _default_text: String
+var _default_icon: Texture2D
+
+func _ready() -> void:
+    _default_text = name_label.text
+    _default_icon = icon_texture.texture
+
+func bind(_item: Option):
+    if _item.is_none():
+        unbind()
+    else:
+        var item = _item.unwrap()
+        name_label.text = item.name
+        icon_texture.texture = item.icon
+
+func unbind():
+    name_label.text = _default_text
+    icon_texture.texture = _default_icon
diff --git a/godot/src/ring_buffer.gd b/godot/src/ring_buffer.gd
index b129fd6..315cf07 100644
--- a/godot/src/ring_buffer.gd
+++ b/godot/src/ring_buffer.gd
@@ -6,6 +6,7 @@ enum Direction {
 }
 
 signal updated(new_range: IntRange, previous_range: IntRange)
+signal rotated(direction: int)
 
 var _source_size: int
 var source_size: int:
@@ -39,13 +40,16 @@ var selected_index: int:
     set(value): set_selected(value)
 
 func set_selected(value: int) -> void:
+    var previous = self.get_range()
     _index = self.index(value)
+    var current = self.get_range()
+    updated.emit(current, previous)
 
 var start_index: int:
-    get: return  self.index(_offset + _index)
+    get: return _index
 
 var end_index: int:
-    get: return self.index(_offset + _index + _capacity - 1)
+    get: return start_index + capacity
 
 @warning_ignore("shadowed_variable")
 func _init(source_size: int, capacity: int, start_index: int = 0, offset: int = 0) -> void:
@@ -62,15 +66,17 @@ func index(value: int) -> int:
     else:
         return value % _source_size
 
-func range() -> BoundedRangeIterator:
-    return BoundedRangeIterator.new(IntRange.new(start_index, end_index), IntRange.new(0, capacity))
+func get_range() -> IntRange:
+    return IntRange.new(start_index, end_index)
+
+func iter() -> BoundedRangeIterator:
+    return BoundedRangeIterator.new(get_range(), IntRange.new(0, _source_size))
 
 func move(direction: Direction) -> Result:
     if _source_size <= _capacity:
-        return Result.err("source size is smaller than buffer capacity")
-    var previous = range()
+        push_warning("source size is smaller than buffer capacity")
     _index = self.index(_index + direction)
-    updated.emit(range(), previous)
+    rotated.emit(direction)
     return Result.Unit
 
 func move_right() -> Result: