diff --git a/sudoku-rust/src/grid/reduce.rs b/sudoku-rust/src/grid/reduce.rs
index e8129f5..bf828cf 100644
--- a/sudoku-rust/src/grid/reduce.rs
+++ b/sudoku-rust/src/grid/reduce.rs
@@ -52,6 +52,17 @@ pub fn reduce(original: PlayingGrid, action: &Action) -> Result<PlayingGrid, Red
                 .map(|(i, x)| {
                     if pos.as_idx() == i {
                         PlayingCell::Definite(value)
+                    } else if
+                    // is a note
+                    let PlayingCell::Note(note) = x
+                        // current value is true
+                        && note[value]
+                        // get index workable
+                        && let idx = Pos::new_from_idx(i)
+                        // is in row column or box
+                        && (pos.x == idx.x || pos.y == idx.y || pos.box_pos() == idx.box_pos())
+                    {
+                        PlayingCell::Note(note.toggle(value))
                     } else {
                         *x
                     }
diff --git a/sudoku-rust/src/types/cell.rs b/sudoku-rust/src/types/cell.rs
index d180a74..b5cfdcc 100644
--- a/sudoku-rust/src/types/cell.rs
+++ b/sudoku-rust/src/types/cell.rs
@@ -1,4 +1,4 @@
-use std::fmt::Display;
+use std::{fmt::Display, ops::Index};
 
 use serde::{Deserialize, Serialize};
 use tsify::Tsify;
@@ -74,6 +74,14 @@ impl PartialEq<SudokuCell> for PlayingCell {
     }
 }
 
+impl Index<SudokuCell> for Note {
+    type Output = bool;
+
+    fn index(&self, index: SudokuCell) -> &Self::Output {
+        &self.0[(Into::<u8>::into(index) - 1) as usize]
+    }
+}
+
 impl Note {
     #[must_use]
     pub fn toggle(&self, value: SudokuCell) -> Self {