Math Game (Ruby)

game.rb

class Game
  # Manages the state of the game
  # Can change turns, ask questions to players, check answers
  def initialize(players, max_points)
    @index = 0
    @players = players
    @max_points = max_points
    @is_start = false
  end

  # Start game, and loop questions until game ends
  def start_game
    @is_start = true

    # Keep asking questions until game has ended
    while (@is_start)
      puts "----- NEW TURN -----"
      self.display_points
      self.ask_question
    end
  end

  protected

  # Change turn by changing index
  def change_turn
    @index += 1

    # Loop back to 0 if index is equal or exceeds the total array length
    if (@index >= @players.length())
      @index = 0
    end
  end

  # Check if game has ended
  def end_game
    puts "----- GAME OVER -----"
    @is_start = false
  end

  # Display total points of each player
  def display_points
    message = ""

    #  Message for displaying points for each player
    @players.each_with_index do |player, index|
      message += "#{player.name}: #{player.points}/#{@max_points} "

      # Add vs. unless there are no more players to go through
      unless (index + 1 == @players.length())
        message += "vs. "
      end
    end

    puts message
  end

  # Ask random question to player
  def ask_question

    # Generate random number
    player_name = @players[@index].name
    num1 = rand(20)
    num2 = rand(20)

    # Ask current question
    puts "#{player_name}: What does #{num1} plus #{num2} equal?"

    # Setup player and actual calculated answer
    actual_answer = num1 + num2
    player_answer = $stdin.gets.chomp.to_i

    # If player is correct, then add point to user
    if (player_answer === actual_answer)
      @players[@index].add_points(1)
      puts "#{player_name}: YES! You are correct."
    else
      # Else, no point is added for current player
      puts "#{player_name}: Seriously? No!"
    end

    # Check winner for every round
    self.check_winner
  end

  # Check if current player has won
  def check_winner

    # Check if current player points matches or is over max points
    if (@players[@index].points >= @max_points)
      self.end_game
      puts "Winner is: #{@players[@index].name}!"
    end

    # Change turn if winner is not decided yet
    self.change_turn
  end
end

main.rb

require ("./game.rb")
require ("./player.rb")

#  Initialize players
player1 = Player.new("Player 1")
player2 = Player.new("Player 2")
player3 = Player.new("Player 3")
player4 = Player.new("Player 4")
player5 = Player.new("Player 5")
game = Game.new([player1, player2, player3, player4, player5], 10)

# Start the actual game
game.start_game

player.rb

class Player
  attr_accessor :name, :points

  # Manages state of player
  # name of player, how many points the player has in the game
  def initialize(name)
    @name = name
    @points = 0
  end

  # Add points to current player
  def add_points(points)
    @points += points
  end
end