diff --git a/nodes/wall_renderer.gd b/nodes/wall_renderer.gd
index e9ed6bc..6fdb6e3 100644
--- a/nodes/wall_renderer.gd
+++ b/nodes/wall_renderer.gd
@@ -25,8 +25,16 @@ const TOP_RIGHT_RECT := Rect2(53, 0, 50, 20)
 const BOTTOM_LEFT_RECT := Rect2(103, 186, 50, 20)
 const BOTTOM_RIGHT_RECT := Rect2(53, 186, 50, 20)
 
+# -- Inner corners (drawn where two perpendicular wall edges meet) --
+const INNER_CORNER_UPPER_LEFT_RECT := Rect2(0, 0, 50, 50)
+const INNER_CORNER_UPPER_RIGHT_RECT := Rect2(156, 0, 50, 50)
+const INNER_CORNER_LOWER_LEFT_RECT := Rect2(0, 156, 50, 50)
+const INNER_CORNER_LOWER_RIGHT_RECT := Rect2(156, 156, 50, 50)
+
 ## Wall thickness in game pixels (how far the border extends into the tile)
 const WALL_THICKNESS := 20.0
+## Inner corner piece size in game pixels (quarter of a tile)
+const CORNER_SIZE := 50.0
 ## Half the tile edge length
 const HALF_EDGE := TILE_SIZE / 2.0
 
@@ -175,8 +183,36 @@ func _draw_outer_corners(_tile: Vector2i, _tile_origin: Vector2, _edges: Array)
 	pass
 
 
-func _draw_inner_corners(_tile: Vector2i, _tile_origin: Vector2, _edges: Array) -> void:
-	# TODO: Implement inner corner segments for non-rectangular rooms
-	# Check diagonal neighbors where both adjacent cardinal neighbors are floor
-	# but the diagonal is a wall/void.
-	pass
+func _draw_inner_corners(_tile: Vector2i, tile_origin: Vector2, edges: Array) -> void:
+	## Draws decorative corner pieces wherever two perpendicular wall edges meet
+	## on the same tile (e.g., a top wall + left wall produces an upper-left corner).
+	var has_top := edges.has(&"top")
+	var has_bottom := edges.has(&"bottom")
+	var has_left := edges.has(&"left")
+	var has_right := edges.has(&"right")
+	var corner_size := Vector2(CORNER_SIZE, CORNER_SIZE)
+
+	if has_top and has_left:
+		_create_segment_sprite(
+			tile_origin + Vector2(0, 0),
+			corner_size,
+			INNER_CORNER_UPPER_LEFT_RECT
+		)
+	if has_top and has_right:
+		_create_segment_sprite(
+			tile_origin + Vector2(TILE_SIZE - CORNER_SIZE, 0),
+			corner_size,
+			INNER_CORNER_UPPER_RIGHT_RECT
+		)
+	if has_bottom and has_left:
+		_create_segment_sprite(
+			tile_origin + Vector2(0, TILE_SIZE - CORNER_SIZE),
+			corner_size,
+			INNER_CORNER_LOWER_LEFT_RECT
+		)
+	if has_bottom and has_right:
+		_create_segment_sprite(
+			tile_origin + Vector2(TILE_SIZE - CORNER_SIZE, TILE_SIZE - CORNER_SIZE),
+			corner_size,
+			INNER_CORNER_LOWER_RIGHT_RECT
+		)