diff --git a/src/game.rs b/src/game.rs
index c75aa68..9f11fff 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -1,7 +1,8 @@
 use crate::color::*;
 use crate::game::board::play_board;
 use crate::game::cell_state::{
-    CellMode, CellValue, CellValueBundle, CellValueNew, DigitValueCell, FixedCell, ManualCandidates,
+    AutoCandidates, CellMode, CellValue, CellValueBundle, CellValueNew, DigitValueCell, FixedCell,
+    ManualCandidates,
 };
 use crate::game::control::control_board;
 use crate::game::input::keyboard_input;
@@ -412,14 +413,14 @@ pub struct DigitCellMarker;
 #[derive(Component, Debug)]
 pub struct AutoCandidateCellMarker {
     pub index: u8,
-    pub selected: bool
+    pub selected: bool,
 }
 
 /// 手动选择的候选数字
 #[derive(Component, Debug)]
 pub struct ManualCandidateCellMarker {
     pub index: u8,
-    pub selected: bool
+    pub selected: bool,
 }
 
 /// 冲突红点
@@ -500,31 +501,61 @@ fn on_unselect_cell(
 
 fn on_new_digit(
     trigger: Trigger<NewDigit>,
-    mut q_cell: Query<(&mut DigitValueCell, &mut CellMode, Option<&FixedCell>)>,
+    mut q_cell: Query<(&mut DigitValueCell, &mut CellMode), Without<FixedCell>>,
     mut commands: Commands,
 ) {
-    if let Ok((mut cell_value, mut cell_mode, opt_fixed)) = q_cell.get_mut(trigger.entity()) {
-        if opt_fixed.is_none() {
-            *cell_mode = CellMode::Digit;
-            let new_digit = trigger.event().0;
+    if let Ok((mut cell_value, mut cell_mode)) = q_cell.get_mut(trigger.entity()) {
+        *cell_mode = CellMode::Digit;
+        let new_digit = trigger.event().0;
 
-            if let Some(old_digit) = cell_value.0 {
-                commands.trigger_targets(RemoveDigit(old_digit), vec![trigger.entity()]);
-            }
-
-            cell_value.0 = Some(new_digit);
+        if let Some(old_digit) = cell_value.0 {
+            commands.trigger_targets(RemoveDigit(old_digit), vec![trigger.entity()]);
         }
+
+        cell_value.0 = Some(new_digit);
     }
 }
 
 fn on_new_candidate(
     trigger: Trigger<NewCandidate>,
-    mut q_cell: Query<(&mut CellValue, Option<&FixedCell>)>,
+    mut q_cell: Query<
+        (
+            &mut DigitValueCell,
+            &mut ManualCandidates,
+            &mut AutoCandidates,
+            &mut CellMode,
+        ),
+        Without<FixedCell>,
+    >,
     auto_mode: Res<AutoCandidateMode>,
+    mut commands: Commands,
 ) {
-    if let Ok((mut cell_value, opt_fixed)) = q_cell.get_mut(trigger.entity()) {
-        if opt_fixed.is_none() {
-            cell_value.insert(CellState::Candidates(trigger.event().0), **auto_mode);
+    if let Ok((mut digit_value, mut manual_candidates, mut auto_candidates, mut cell_mode)) =
+        q_cell.get_mut(trigger.entity())
+    {
+        let new_candidate = trigger.event().0;
+        match cell_mode.as_ref() {
+            CellMode::Digit => {
+                if let Some(digit) = digit_value.0 {
+                    commands.trigger_targets(RemoveDigit(digit), vec![trigger.entity()]);
+                }
+                digit_value.0 = None;
+                if **auto_mode {
+                    *cell_mode = CellMode::AutoCandidates;
+                    auto_candidates.insert(new_candidate);
+                } else {
+                    *cell_mode = CellMode::ManualCandidates;
+                    manual_candidates.insert(new_candidate);
+                }
+            }
+            CellMode::AutoCandidates => {
+                auto_candidates.insert(new_candidate);
+            }
+            CellMode::ManualCandidates => {
+                println!("manual_candidates: {:?} {:?}", manual_candidates.0, new_candidate);
+                manual_candidates.insert(new_candidate);
+                println!("manual_candidates: {:?}", manual_candidates.0);
+            }
         }
     }
 }
@@ -583,11 +614,11 @@ fn check_solver(
 pub struct CleanCell;
 
 #[derive(Event)]
-pub struct NewCandidate(pub Set<Digit>);
+pub struct NewCandidate(pub Digit);
 
 impl NewCandidate {
     pub fn new(digit: u8) -> NewCandidate {
-        NewCandidate(Digit::new(digit).as_set())
+        NewCandidate(Digit::new(digit))
     }
 }
 
diff --git a/src/game/board.rs b/src/game/board.rs
index d5d13cd..0dc9d55 100644
--- a/src/game/board.rs
+++ b/src/game/board.rs
@@ -330,9 +330,12 @@ fn show_manual_candidates(
                     if manual_candidates
                         .0
                         .contains(Digit::new(cell_marker.index).as_set())
-                        && cell_marker.selected
                     {
+                        cell_marker.selected = true;
                         *text_color = TextColor(*GRAY2);
+                    } else {
+                        cell_marker.selected = false;
+                        *text_color = TextColor(TRANSPARENT);
                     }
                 } else {
                     *text_color = TextColor(TRANSPARENT);
@@ -348,7 +351,6 @@ fn show_preview_number(
     mut commands: Commands,
 ) {
     for (entity, mut text_color, mut preview) in candidate_cell.iter_mut() {
-
         if preview.hold {
             *text_color = TextColor(*GRAY);
             continue;
@@ -474,10 +476,7 @@ fn manual_candidate_cell_click(
     candidate_cell.selected = !candidate_cell.selected;
     for ancestor in parent_query.iter_ancestors(click.entity()) {
         if let Ok(mut cell_value) = q_select.get_mut(ancestor) {
-            let mut old_set = cell_value.0;
-            old_set.bitor_assign(Digit::new(candidate_cell.index).as_set());
-
-            cell_value.0 = old_set;
+            cell_value.insert(Digit::new(candidate_cell.index));
 
             commands.entity(click.entity()).remove::<PreviewCandidate>();
         }
@@ -494,7 +493,6 @@ fn manual_candidate_cell_move(
     for ancestor in parent_query.iter_ancestors(trigger.entity()) {
         if let Ok(_cell_value) = q_select.get(ancestor) {
             if let Ok(manual_marker) = cell.get(trigger.entity()) {
-                println!("manual candidate cell move {:?}", manual_marker);
                 if !manual_marker.selected {
                     commands
                         .entity(trigger.entity())
@@ -503,5 +501,4 @@ fn manual_candidate_cell_move(
             }
         }
     }
-
 }
diff --git a/src/game/cell_state.rs b/src/game/cell_state.rs
index 64a5d24..1e99652 100644
--- a/src/game/cell_state.rs
+++ b/src/game/cell_state.rs
@@ -1,5 +1,5 @@
 use bevy::prelude::*;
-use std::ops::BitOrAssign;
+use std::ops::{BitOrAssign, BitXorAssign};
 use sudoku::bitset::Set;
 use sudoku::board::{CellState, Digit};
 
@@ -43,9 +43,22 @@ pub struct DigitValueCell(pub Option<Digit>);
 #[derive(Component, Debug)]
 pub struct AutoCandidates(pub Set<Digit>);
 
+impl AutoCandidates {
+    pub fn insert(&mut self, digit: Digit) {
+        self.0.bitxor_assign(digit);
+    }
+}
+
 #[derive(Component, Debug)]
 pub struct ManualCandidates(pub Set<Digit>);
 
+impl ManualCandidates {
+    pub fn insert(&mut self, digit: Digit) {
+        self.0.bitxor_assign(digit);
+    }
+
+}
+
 #[derive(Component, Debug, PartialEq, Eq)]
 pub enum CellMode {
     Digit,