Tic Tac Toe Winner Check

tic_tac_toe_win_check.rb

game = [["x","x", "o"],["x", "o", "x"], ["x", "o", "x"]]

def game_winner?(game, player_sign)
  result =  get_winning_sign(game)
  if result.nil?
    return game.flatten.include?(nil) ? "Game in Progress" : "Draw"
  else
    return result == player_sign ? "Player #{player_sign} is the winner" : "Player #{player_sign} is the loser"
  end
end

def get_winning_sign(game)
  x_val = check_x(game)
  y_val = check_y(game)
  z_val = check_z(game)
  [x_val, y_val, z_val].compact.first
end

def check_z(game)
  check1 = [game[0][0], game[1][1], game[2][2]].uniq
  check2 = [game[0][2], game[1][1], game[2][0]].uniq
  if check1.count == 1
    return check1.first
  elsif check2.count == 1
    return check2.first
  end
end

def check_y(game)
  3.times do |x|
    values = [game[0][x], game[1][x], game[2][x]].uniq
    return values.first if values.count == 1
  end
  nil
end

def check_x(game)
  row = game[0].uniq.count == 1
  row1 = game[1].uniq.count == 1
  row2 = game[2].uniq.count == 1
  if row || row1 || row2
    winning_index = [row, row1, row2].index(true)
    return game[winning_index].uniq.first
  else
    return nil
  end
end