Restarting the game

We already determine the size of the arena and the number of zombies by the value of the wave variable. We must also reset the ammo and gun-related variables, as well as setting wave and score to zero at the start of each new game. Find the following code in the event-handling section of the game loop and add the following highlighted code:

// Start a new game while in GAME_OVER state
else if (event.key.code == Keyboard::Return &&
    state == State::GAME_OVER)
{
    state = State::LEVELING_UP;
    wave = 0;
    score = 0;
    // Prepare the gun and ammo for next game
    currentBullet = 0;
    bulletsSpare = 24;
    bulletsInClip = 6;
    clipSize = 6;
    fireRate = 1;
    // Reset the player's stats
    player...