diff --git a/inventory/InventoryManager.gd b/inventory/InventoryManager.gd
new file mode 100644
index 0000000..df7be72
--- /dev/null
+++ b/inventory/InventoryManager.gd
@@ -0,0 +1,101 @@
+extends Node
+
+# Signals
+signal item_acquired(item_id: String)
+signal item_removed(item_id: String)
+signal inventory_changed
+signal combination_attempted(item_a_id: String, item_b_id: String)
+
+# State
+var inventory: Array[String] = []
+var obtained_items: Dictionary = {}
+var stripped_items: Array[String] = []
+var selected_item: String = ""
+
+# Item definitions registry
+var _item_definitions: Dictionary = {}
+
+
+# -- Queries --
+
+func has_item(item_id: String) -> bool:
+	return inventory.has(item_id)
+
+func has_obtained(item_id: String) -> bool:
+	return obtained_items.has(item_id)
+
+func has_any_of(item_ids: Array[String]) -> bool:
+	if item_ids.is_empty():
+		return false
+	for item_id in item_ids:
+		if has_item(item_id):
+			return true
+	return false
+
+func has_obtained_any_of(item_ids: Array[String]) -> bool:
+	if item_ids.is_empty():
+		return false
+	for item_id in item_ids:
+		if has_obtained(item_id):
+			return true
+	return false
+
+func has_obtained_all_of(item_ids: Array[String]) -> bool:
+	if item_ids.is_empty():
+		return true
+	for item_id in item_ids:
+		if not has_obtained(item_id):
+			return false
+	return true
+
+
+# -- Mutations --
+
+func acquire_item(item_id: String) -> void:
+	inventory.append(item_id)
+	obtained_items[item_id] = true
+	item_acquired.emit(item_id)
+	inventory_changed.emit()
+
+func remove_item(item_id: String, quiet: bool = false) -> void:
+	var idx = inventory.find(item_id)
+	if idx == -1:
+		return
+	inventory.remove_at(idx)
+	if not quiet:
+		item_removed.emit(item_id)
+	inventory_changed.emit()
+
+func bulk_strip_items(event_items: Array[String], exempt_items: Array[String] = []) -> void:
+	var remaining: Array[String] = []
+	for item_id in inventory:
+		if event_items.has(item_id) and not exempt_items.has(item_id):
+			stripped_items.append(item_id)
+		else:
+			remaining.append(item_id)
+	inventory = remaining
+	inventory_changed.emit()
+
+
+# -- Items --
+
+func register_item(item_def: ItemDefinition) -> void:
+	_item_definitions[item_def.id] = item_def
+
+func get_item_definition(item_id: String) -> ItemDefinition:
+	return _item_definitions.get(item_id, null)
+
+
+# -- Combinations --
+
+func attempt_combine(item_a_id: String, item_b_id: String) -> void:
+	combination_attempted.emit(item_a_id, item_b_id)
+
+
+# -- Selection --
+
+func select_item(item_id: String) -> void:
+	selected_item = item_id
+
+func clear_selection() -> void:
+	selected_item = ""