diff --git a/src/main/scala/ninetyNineScalaProblems/Problem28.scala b/src/main/scala/ninetyNineScalaProblems/Problem28.scala
new file mode 100644
index 0000000..e3d6312
--- /dev/null
+++ b/src/main/scala/ninetyNineScalaProblems/Problem28.scala
@@ -0,0 +1,7 @@
+package ninetyNineScalaProblems
+
+import scala.annotation.tailrec
+
+object Problem28:
+    def lsort(list: List[List[Any]]): List[Any] =
+        list.sortWith((a, b) => a.length < b.length)
\ No newline at end of file
diff --git a/src/test/scala/ninetyNineScalaProblems/Problem28Suite.scala b/src/test/scala/ninetyNineScalaProblems/Problem28Suite.scala
new file mode 100644
index 0000000..98c909a
--- /dev/null
+++ b/src/test/scala/ninetyNineScalaProblems/Problem28Suite.scala
@@ -0,0 +1,15 @@
+package ninetyNineScalaProblems
+
+class Problem26Suite extends munit.FunSuite:
+    List(
+        (List(List(1, 2), List(1, 2, 3, 4), List(1, 2, 3)), List(List(1, 2), List(1, 2, 3), List(1, 2, 3, 4))),
+        (List(List(1, 2), List(1, 2, 3), List(1, 2, 3, 4)), List(List(1, 2), List(1, 2, 3), List(1, 2, 3, 4))),
+        (List(), List()),
+        (List(List(1)), List(List(1))),
+        (List(List(1), List(1)), List(List(1), List(1))),
+        (List(List(1, 2, 3), List(4, 5), List(6, 7, 8), List(4, 5), List(9, 10, 11, 12), List(13, 14), List(15)),
+         List(List(15), List(4, 5), List(4, 5), List(13, 14), List(1, 2, 3), List(6, 7, 8), List(9, 10, 11, 12))),
+    ).foreach:
+        case (list, expected) =>
+            test(s"lsort returns [$expected]"):
+                assertEquals(Problem28.lsort(list), expected)
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