diff --git a/src/ball.cpp b/src/ball.cpp
new file mode 100644
index 0000000..a18ecda
--- /dev/null
+++ b/src/ball.cpp
@@ -0,0 +1,51 @@
+#include <Arduino.h>
+#include <stdint.h>
+#include "config.h"
+
+class Ball {
+
+  private:
+
+    uint8_t _x, _y;
+    int8_t _direction_x, _direction_y;
+
+    void _init_directions(int8_t &_direction) {
+      if (random(2) == 0) _direction= 1;
+      else _direction= -1;
+    }
+
+  public:
+
+    void move() {
+      if (!_direction_x) _init_directions(_direction_x);
+      if (!_direction_y) _init_directions(_direction_y);
+
+      if (_x + _direction_x >= 0 && _x + _direction_x < MATRIX_WIDTH)
+        _x+= _direction_x;
+      if (_y + _direction_y >= 0 && _y + _direction_y < MATRIX_HEIGHT)
+        _y+= _direction_y;
+    }
+
+    void bounce_on_pad() {
+      _direction_x *= -1;
+    }
+
+    void bounce_on_sides() {
+      _direction_y *= -1;
+    }
+
+    void reset_position () {
+      _x= BALL_RESET_X;
+      _y= BALL_RESET_Y;
+      _init_directions(_direction_x);
+      _init_directions(_direction_y);
+    }
+
+    uint8_t get_x() {
+      return _x;
+    }
+
+    uint8_t get_y() {
+      return _y;
+    }
+};
diff --git a/src/ball.h b/src/ball.h
new file mode 100644
index 0000000..0987edd
--- /dev/null
+++ b/src/ball.h
@@ -0,0 +1,21 @@
+#ifndef PLAYER_H
+#define PLAYER_H
+
+#include <stdint.h>
+#include "config.h"
+
+class Ball {
+  private:
+    uint8_t _x, _y;
+    int8_t _direction_x, _direction_y;
+
+  public:
+    void move();
+    void bounce_on_pad();
+    void bounce_on_sides();
+    void reset_position ();
+    uint8_t get_x();
+    uint8_t get_y();
+};
+
+#endif
diff --git a/src/engine.cpp b/src/engine.cpp
new file mode 100644
index 0000000..bf68d2e
--- /dev/null
+++ b/src/engine.cpp
@@ -0,0 +1,69 @@
+#include <Arduino.h>
+#include "ball.h"
+#include "paddle.h"
+#include "config.h"
+
+class Engine {
+
+  private:
+    Paddle& _p1;
+    Paddle& _p2;
+    Ball& _ball;
+    uint8_t _p1_score, _p2_score;
+    uint8_t _hits;
+
+    bool _check_pad_ball_collision(Paddle &p1, Ball &ball) {
+      return false;
+    }
+
+    void point_scored(Ball &ball) {
+      ball.reset_position();
+
+      Serial.print("P1: ");
+      Serial.print(_p1_score);
+      Serial.print(" - ");
+      Serial.print("P2: ");
+      Serial.print(_p2_score);
+      Serial.println();
+
+      _hits= 0;
+      // ball_delay= INITIAL_BALL_DELAY;
+    }
+
+  public:
+    // inizialize Engine constructor, linking all args with private args
+    Engine(Paddle &p_one, Paddle &p_two, Ball &ball): _p1(p_one), _p2(p_two), _ball(ball) {}
+
+    void run(uint8_t &ball_delay) {
+      _ball.move();
+      uint8_t bx= _ball.get_x();
+      uint8_t by= _ball.get_y();
+
+      if (bx == 0) {
+        if (!_check_pad_ball_collision(_p1, _ball)) {
+          // p2 scores
+          _p2_score +=1;
+          Serial.println("Player 2 Scores");
+        }
+        else {
+          _hits += 1;
+          _ball.bounce_on_pad();
+        }
+      }
+      else if (bx >= MATRIX_WIDTH-1) {
+        if (!_check_pad_ball_collision(_p2, _ball)) {
+          // p1 scores
+          _p1_score += 1;
+          Serial.println("Player 1 Scores");
+        }
+      }
+
+      if (by == 0 || by == MATRIX_HEIGHT-1) _ball.bounce_on_sides();
+
+      if (_hits >= 6 && ball_delay >= 80) {
+        // increase ball speed
+        _hits= 0;
+        ball_delay-= 20;
+      }
+    }
+};
diff --git a/src/paddle.cpp b/src/paddle.cpp
new file mode 100644
index 0000000..3b7c33c
--- /dev/null
+++ b/src/paddle.cpp
@@ -0,0 +1,32 @@
+#include <stdint.h>
+#include "config.h"
+
+class Paddle {
+
+  private:
+    // define player coordinates
+    uint8_t _position, _height;
+    bool _human;
+
+  public:
+    void move_pad_up(bool &need_refresh) {
+      if (_position > 0) {
+        _position -= 1;
+        need_refresh= true;
+      }
+    }
+    void move_pad_down(bool &need_refresh) {
+      if (_position + _height <= MATRIX_HEIGHT) {
+        _position += 1;
+        need_refresh= true;
+      }
+    }
+
+    uint8_t get_position() {
+      return _position;
+    }
+
+    bool is_human() {
+      return _human;
+    }
+};
diff --git a/src/paddle.h b/src/paddle.h
new file mode 100644
index 0000000..3f0a927
--- /dev/null
+++ b/src/paddle.h
@@ -0,0 +1,21 @@
+#ifndef PADDLE_H
+#define PADDLE_H
+
+#include <stdint.h>
+#include "config.h"
+
+class Paddle {
+
+  private:
+    // define player coordinates
+    uint8_t position, height;
+    bool human;
+
+  public:
+    void move_pad_up(bool &need_refresh);
+    void move_pad_down(bool &need_refresh);
+    uint8_t get_position();
+    bool is_human();
+};
+
+#endif