diff --git a/src/solve_2025_01.gleam b/src/solve_2025_01.gleam
index 0c7ce91..3fb5891 100644
--- a/src/solve_2025_01.gleam
+++ b/src/solve_2025_01.gleam
@@ -12,16 +12,19 @@ pub fn part_one(input: String) -> Int {
 }
 
 pub fn part_two(input: String) -> Int {
-  let rotations = parse(input)
-  let #(_, seen) = {
-    use accumulator, rotation <- list.fold(rotations, #(50, 0))
-    let #(previous, seen) = accumulator
-    echo #(previous, seen, rotation, rotation / 100)
-    // const via_zero = ???
-    #({ previous + rotation } % 100, seen + { rotation / 100 })
-  }
-
-  seen
+  input
+  |> parse
+  |> list.prepend(0)
+  |> list.scan(50, int.add)
+  |> list.window_by_2
+  |> list.fold(0, fn(accumulator, pair) {
+    let #(from, to) = pair
+    list.range(from, to)
+    |> list.drop(1)
+    |> echo
+    |> list.count(fn(position) { position % 100 == 0 })
+    |> int.add(accumulator)
+  })
 }
 
 fn count_zeros(numbers: List(Int)) -> #(Int, Int) {
@@ -45,10 +48,3 @@ fn parse(input: String) -> List(Int) {
     Error(_) -> []
   }
 }
-
-fn rotate(value: Int, cycle: Int) -> #(Int, Int) {
-  case value % cycle {
-    value if value < 0 -> #(value % cycle, value / cycle)
-    _ -> #(value, 0)
-  }
-}
diff --git a/test/test_2025_01.gleam b/test/test_2025_01.gleam
index f9c49dc..42971a3 100644
--- a/test/test_2025_01.gleam
+++ b/test/test_2025_01.gleam
@@ -21,10 +21,11 @@ pub fn part_one_test() {
     |> solve_2025_01.part_one
   assert result == 3
 }
-// pub fn part_two_test() {
-//   let result =
-//     input
-//     |> string.trim
-//     |> solve_2025_01.part_two
-//   assert result == 6
-// }
+
+pub fn part_two_test() {
+  let result =
+    input
+    |> string.trim
+    |> solve_2025_01.part_two
+  assert result == 6
+}