diff --git a/colorchoosebutton.cpp b/colorchoosebutton.cpp
index a116180..199c823 100644
--- a/colorchoosebutton.cpp
+++ b/colorchoosebutton.cpp
@@ -12,7 +12,6 @@ ColorChooseButton::ColorChooseButton(QWidget* parent)
 
 void ColorChooseButton::buttonClicked()
 {
-    qDebug() << "button clicked";
     color = QColorDialog::getColor(color);
     setColor(color);
 }
diff --git a/main.cpp b/main.cpp
index 337ecee..647b7c2 100644
--- a/main.cpp
+++ b/main.cpp
@@ -5,8 +5,7 @@
 
 #include <QtWidgets>
 #include <ctime>
-
-// add showing mines left
+// TODO: add hints, for example it will open cells, that marked as question
 int main(int argc, char* argv[])
 {
     srand(time(0));
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 0d4b922..9f6430e 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -4,7 +4,6 @@
 #include "ui_mainwindow.h"
 #include "wongamedialog.h"
 
-// TODO: добавить показ количества оставшихся мин
 MainWindow::MainWindow(QWidget* parent)
     : QMainWindow(parent)
     , ui(new Ui::MainWindow)
@@ -17,8 +16,15 @@ MainWindow::MainWindow(QWidget* parent)
     minesFieldWidget->setCellSize(QSize(25, 25));
     minesFieldWidget->setBorderSize(QSize(0, 0));
 
-    connect(minesField.get(), SIGNAL(userLost()), this, SLOT(loseGame()));
-    connect(minesField.get(), SIGNAL(userWon()), this, SLOT(wonGame()));
+    connect(minesField.get(), SIGNAL(userLost()),
+        this, SLOT(loseGame()));
+    connect(minesField.get(), SIGNAL(userWon()),
+        this, SLOT(wonGame()));
+
+    connect(minesField.get(), SIGNAL(markedCellsCountChanged()),
+        this, SLOT(markedCellCountChanged()));
+
+    markedCellCountChanged();
 }
 
 MainWindow::~MainWindow()
@@ -54,8 +60,6 @@ bool MainWindow::event(QEvent* event)
             minesFieldWidget->verticalScrollPosChanged(1);
         }
 
-        qDebug() << cursorPos << "?" << cell.x() << ":" << cell.y();
-
         auto stepSize = minesFieldWidget->getCellSize() + minesFieldWidget->getBorderSize();
         QPoint cellPos = QPoint(cell.x() * stepSize.width() + stepSize.width() / 2,
             cell.y() * stepSize.height() + stepSize.height() / 2);
@@ -120,6 +124,11 @@ void MainWindow::wonGame()
     }
 }
 
+void MainWindow::markedCellCountChanged()
+{
+    setWindowTitle(QString("mines left: ") + QString::number(minesField->getMinesCount() - minesField->getMarkedCells()));
+}
+
 //bool MainWindow::event(QEvent* event)
 //{
 // return true;
@@ -146,6 +155,10 @@ void MainWindow::on_actionNew_game_triggered()
 
         connect(minesField.get(), SIGNAL(userLost()), this, SLOT(loseGame()));
         connect(minesField.get(), SIGNAL(userWon()), this, SLOT(wonGame()));
+        connect(minesField.get(), SIGNAL(markedCellsCountChanged()),
+            this, SLOT(markedCellCountChanged()));
+
+        markedCellCountChanged();
 
         minesFieldWidget->setCellSize(data.cellSize);
         minesFieldWidget->setBorderSize(data.borderSize);
diff --git a/mainwindow.h b/mainwindow.h
index 6c99524..1e187b2 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -23,6 +23,7 @@ class MainWindow : public QMainWindow {
 public slots:
     void loseGame();
     void wonGame();
+    void markedCellCountChanged();
 private slots:
     void on_actionNew_game_triggered();
 
diff --git a/minesfield.cpp b/minesfield.cpp
index 147d32d..dd1176f 100644
--- a/minesfield.cpp
+++ b/minesfield.cpp
@@ -19,7 +19,6 @@ MinesField::MinesField(unsigned rows, unsigned cols, unsigned char mp)
     minesLeft = minesCount = rows * cols * minesPercents;
     srand(time(0));
 
-    qDebug() << "start creating field";
     cells = std::vector<Cell>(this->rows * this->cols);
     // генерим мины в первых minesCount элементах массива
     for (unsigned i = 0; i < minesCount; i++) {
@@ -73,7 +72,6 @@ MinesField::MinesField(unsigned rows, unsigned cols, unsigned char mp)
     }
 
     created = true;
-    qDebug() << "finish creating field";
 }
 
 MinesField::~MinesField()
@@ -172,6 +170,11 @@ bool MinesField::getCreated() const
     return created;
 }
 
+unsigned MinesField::getMarkedCells() const
+{
+    return markedCells;
+}
+
 void MinesField::tryToOpenCell(const Point& point)
 {
     // да, костыль, но перемещать игровую логику в отдельный поток дольше
@@ -254,11 +257,18 @@ void MinesField::markCell(const Point& point, Cell::CellState markAs)
     switch (markAs) {
     case Cell::CellState::MarkedAsBomb:
         cell.setCellState(Cell::CellState::MarkedAsBomb);
-        minesLeft--;
+
+        if (cell.isMine())
+            minesLeft--;
+        markedCells++;
+        emit markedCellsCountChanged();
         break;
     case Cell::CellState::MarkedAsQuestion:
         cell.setCellState(Cell::CellState::MarkedAsQuestion);
-        minesLeft++;
+        if (cell.isMine())
+            minesLeft++;
+        markedCells--;
+        emit markedCellsCountChanged();
         break;
     default:
         break;
@@ -286,8 +296,13 @@ void MinesField::unmarkCell(const Point& point)
     if (!(cell.cellState() == Cell::CellState::MarkedAsBomb || cell.cellState() == Cell::CellState::MarkedAsQuestion))
         return;
 
+    if (cell.cellState() == Cell::CellState::MarkedAsBomb) {
+        minesLeft++;
+        markedCells--;
+        emit markedCellsCountChanged();
+    }
+
     cell.setCellState(Cell::CellState::Closed);
-    minesLeft++;
     checkForWin();
 }
 
diff --git a/minesfield.h b/minesfield.h
index 46e7196..ef40fd1 100644
--- a/minesfield.h
+++ b/minesfield.h
@@ -47,15 +47,19 @@ class MinesField : public QObject {
 
     bool getCreated() const;
 
+    unsigned getMarkedCells() const;
+
 signals:
     void userLost();
     void userWon();
+    void markedCellsCountChanged();
 public slots:
 
 private:
     std::vector<Cell> cells;
     unsigned minesCount = 0;
     int minesLeft = 0;
+    unsigned markedCells = 0;
     unsigned rows;
     unsigned cols;
     double minesPercents = 0;
diff --git a/minesfieldwidget.cpp b/minesfieldwidget.cpp
index 62dfc7b..bc6500b 100644
--- a/minesfieldwidget.cpp
+++ b/minesfieldwidget.cpp
@@ -195,11 +195,10 @@ void MinesFieldWidget::mouseMoveEvent(QMouseEvent* event)
 
 void MinesFieldWidget::updatingThreadFinished()
 {
-    qDebug() << "updating thread finished";
     update();
     if (isUpdatingQueued) {
         isUpdatingQueued = false;
-        thread->start(QThread::HighestPriority); //TODO: do
+        thread->start(QThread::HighestPriority);
     }
 }
 
diff --git a/minesfieldwidgetupdaterthread.cpp b/minesfieldwidgetupdaterthread.cpp
index 9ee31b9..bac5a72 100644
--- a/minesfieldwidgetupdaterthread.cpp
+++ b/minesfieldwidgetupdaterthread.cpp
@@ -63,5 +63,4 @@ void MinesFieldWidgetUpdaterThread::run()
     minesFieldWidget->updatingMutex.unlock();
     static int n = 1;
     n++;
-    qDebug() << "thread finished" << n;
 }