Set up window
Load resources (images and sound)
Initialize needed variables such as position of ball and players

// Main loop
While not escape pressed
    // Read keyboard
    if keyup pressed
        move yPlayer up
    if keydown pressed
        move yPlayer down

    // Move ball according to hspeed and vspeed

    // Move computer opponent
    if ball above opponent
        move opponent up
    if ball below opponent
        move opponent down

    // Draw graphics
    draw playfield
    draw ball
    draw player
    draw opponent

    if ball collide with player or opponent
    change ball horizontal direction
        play collision sound

    if ball collide with borders
        change ball vertical direction
        play collision sound

    if ball out of screen
        reset ball
        add point to player who touched ball last
end loop