diff --git a/06/tasks/task_28_flatten_list.py b/06/tasks/task_28_flatten_list.py
index 56f4d8f..65c925d 100644
--- a/06/tasks/task_28_flatten_list.py
+++ b/06/tasks/task_28_flatten_list.py
@@ -2,7 +2,13 @@
 
 def flatten_list(nested: list[list[int]]) -> list[int]:
     """
-    Převede dvourozměrný seznam na jednorozměrný.
+    Converts a multi-nested list to a single-dimensional list.
     """
+    flat_list = []
+    for item in nested:
+        if isinstance(item, list):
+            flat_list.extend(flatten_list(item))
+        else:
+            flat_list.append(item)
 
-    return [digit for sublist in nested for digit in sublist]
+    return flat_list
diff --git a/06/test_28_flatten_list.py b/06/test_28_flatten_list.py
index 50ff6c2..b2c17f9 100644
--- a/06/test_28_flatten_list.py
+++ b/06/test_28_flatten_list.py
@@ -12,4 +12,8 @@ def test_flatten_list():
     assert flatten_list([[0], [0, 0]]) == [0, 0, 0]
     assert flatten_list([[10, 20], [30], [], [40, 50, 60]]) == [10, 20, 30, 40, 50, 60]
     assert flatten_list([[1], [], [], [], [2]]) == [1, 2]
+    assert flatten_list([[[1]], 2, [3, [4]]]) == [1, 2, 3, 4]
+    assert flatten_list([0, [0, [0]]]) == [0, 0, 0]
+    assert flatten_list([10, [20, [30, [40]]]]) == [10, 20, 30, 40]
+    assert flatten_list([1, [2], 3, [4, [5, [6]]]]) == [1, 2, 3, 4, 5, 6]