diff --git a/lab4/main.py b/lab4/main.py
new file mode 100644
index 0000000..a885203
--- /dev/null
+++ b/lab4/main.py
@@ -0,0 +1,171 @@
+from __future__ import annotations
+import pygame
+import sys
+from dataclasses import dataclass, field
+import time
+import numpy as np
+import typing
+from random import uniform, choice
+if typing.TYPE_CHECKING:
+    from nptyping import NDArray
+
+
+pygame.init()
+# width and height of the screen
+W, H = 900, 800
+# ball's lifetime (seconds)
+DEFAULT_TTL = 3
+# ball's radius (default)
+DEFAULT_RADIUS = 20
+# time delta, ms
+dt = 10
+# load the font
+font = pygame.font.Font('orbitron-medium.otf', 15)
+N_BALLS = 18
+
+# List of ball types: [(radius, speed, color, points)]
+BALL_TYPES = [(25, 0.035, (185, 20, 50), 10), (18, 0.055, (220, 0, 0), 30), (20, 0.05, (60, 0, 160), 20)]
+
+
+@dataclass
+class Game:
+    """
+    Class for everything connected to the game
+
+    :param score: user's score
+    :param balls: the list of balls
+    :param target_ball_number: the target number of balls on screen at a given time
+    """
+    score: int = 0
+    balls: typing.List[Ball] = field(default_factory=lambda: [Ball.new_random() for _ in range(N_BALLS)])
+    target_ball_number: int = N_BALLS
+
+    def draw_everything(self, screen: pygame.Surface):
+        """
+        Draw everything (for example, balls) on screen
+        :param screen: the screen
+        """
+        for ball in self.balls:
+            ball.draw_the_ball(screen)
+
+    def process_click(self, x: float, y: float):
+        """
+        Process mouse click, check if the user clicked on a ball and process it
+        :param x: click's x coordinate
+        :param y: click's y coordinate
+        """
+        for i in range(len(self.balls)):
+            if self.balls[i].is_point_inside(x, y):
+                self.score += self.balls[i].points
+                self.balls.pop(i)
+                break
+
+    def tick(self, dt: float):
+        """
+        Progress for some time
+
+        dt: time period, ms
+        """
+        if len(self.balls) < self.target_ball_number:
+            n_balls = round((self.target_ball_number - len(self.balls))) # * (1 - 0.9 ** dt))
+            self.balls.extend([Ball.new_random() for _ in range(n_balls)])
+        for ball in self.balls:
+            ball.tick(dt)
+
+
+@dataclass
+class Ball:
+    """
+    The ball the user has to catch
+
+    :param points: the number of points the user gets for catching this ball
+    :param position: ball's position on the screen
+    :param velocity: ball's velocity, px/ms
+    :param time_of_death: the time when this ball will be destroyed. Its death is pre-determined, which is probably
+    very sad and depressing
+    :param radius: the radius of the ball on screen in pixels
+    :param color: ball's color
+    """
+    points: int = 10
+    position: NDArray[(2,), float] = field(default_factory=lambda: np.array([uniform(0, W), uniform(0, H)]))
+    velocity: NDArray[(2,), float] = field(default_factory=lambda: np.array([0, 0]))
+    time_of_death: float = field(default_factory=lambda: time.time() + DEFAULT_TTL)
+    radius: float = DEFAULT_RADIUS
+    color: typing.Tuple[int, int, int] = (255, 0, 0)
+
+    @classmethod
+    def new_random(cls) -> Ball:
+        radius, speed, color, points = choice(BALL_TYPES)
+        angle = uniform(0, np.pi)
+        return cls(points, radius=radius, color=color, velocity=speed * np.array([np.sin(angle), np.cos(angle)]))
+
+    def draw_the_ball(self, screen: pygame.Surface):
+        """
+        Just draw the ball on the screen
+        :param screen: the screen, obviously
+        """
+        pygame.draw.circle(screen, self.color, self.position.tolist(), self.radius)
+        text_surface = font.render(str(self.points), False, (0, 0, 0))
+        screen.blit(text_surface, (
+            round(self.position[0] - text_surface.get_rect().width / 2),
+            round(self.position[1] - text_surface.get_rect().height / 2)
+        ))
+
+    def is_point_inside(self, x: float, y: float) -> bool:
+        """
+        Check if a given point is inside this circle (to handle click events)
+        :param x: point's x coordinate
+        :param y: point's y coordinate
+        """
+        return (self.position[0] - x) ** 2 + (self.position[1] - y) ** 2 <= self.radius ** 2
+
+    def tick(self, dt: float):
+        """
+        Progress for time dt (move the ball according to speed)
+        dt: time in ms
+        """
+        self.position += self.velocity * dt
+        if self.position[0] - self.radius < 0:
+            self.position[0] = self.radius
+            self.velocity[0] *= -1
+        if self.position[0] >= W - self.radius:
+            self.position[0] = W - self.radius
+            self.velocity[0] *= -1
+        if self.position[1] < self.radius:
+            self.position[1] = self.radius
+            self.velocity[1] *= -1
+        if self.position[1] >= H - self.radius:
+            self.position[1] = H - self.radius
+            self.velocity[1] *= -1
+
+
+# create the display surface object  
+screen = pygame.display.set_mode((W, H))
+
+game = Game()
+  
+# set the window name 
+pygame.display.set_caption("Capture the ball!")
+    
+# the main loop
+while True:
+    # time delay of dt
+    pygame.time.delay(dt)
+      
+    # iterate over the list of Event objects  
+    # that was returned by pygame.event.get() method.  
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            pygame.quit()
+            sys.exit(0)
+        if event.type == pygame.MOUSEBUTTONUP:
+            game.process_click(*pygame.mouse.get_pos())
+
+    # clear the screen
+    screen.fill((40, 46, 70))
+    game.tick(dt)
+    game.draw_everything(screen)
+    
+    pygame.display.update() 
+  
+
diff --git a/lab4/orbitron-medium.otf b/lab4/orbitron-medium.otf
new file mode 100644
index 0000000..c16ae86
Binary files /dev/null and b/lab4/orbitron-medium.otf differ