Rock, Paper, Scissor - the Terminal Game

rockpaper.rb

def welcome
  puts "
  Hi, wanna play \"Rock, Paper, Scissor\"? (y/n)"
  $score = [0, 0]
  init(gets.chomp.split("").first.downcase)
end

def init(answer = "")
  if (answer == "y")
    puts "  Cool. You know the rules?"
    rules(gets.chomp.split("").first.downcase)
  elsif (answer == "n")
    puts "  You're scared. I get it. Bye, then."
    return
  else
    puts "  Sorry, I didn't get it. Wanna play or not?"
    init(gets.chomp.split("").first.downcase)
  end
end

def rules(answer = "")
  if (answer == "y")
    puts "
  Ok, then. Let's go, your move.
  Pick one: \"R̲ock\", \"P̲aper\" or \"S̲cissor\""
    game(gets.chomp.split("").first.downcase)
  elsif (answer == "n")
    puts "
  Alright, listen. It's fairly simple:
    Both of us pick one out of three weapons,
    \"Rock\", \"Paper\" or \"Scissor\".\n
    Then we'll see:
    \"Paper\" beats \"Rock\",
    \"Rock\" beats \"Scissor\" but
    \"Scissor\" beats \"Paper\".\n
    Got it? Cool. Let's go, what's your choice? (r/p/s)"
    game(gets.chomp.split("").first.downcase)
  else
    puts "  Sorry, I didn't get it. Do you know the rules or not? (y/n)"
    rules(gets.chomp.split("").first.downcase)
  end
end

def game(player = "")
  arsenal = { "r"=>"rock", "p"=>"paper", "s"=>"scissor" }

  if (player == "r" || player == "p" || player == "s")
    cpu = rand(3) # random integer (0,1,2)
    result = [cpu, player]
    case result
    when [0, "r"], [1, "p"], [2, "s"]
      puts "\n  My #{arsenal.values[cpu]} is equal to your #{arsenal[player]}."
      puts "  So it's a draw."
    when [1, "r"], [2, "p"], [0, "s"]
      puts "\n  Hah! My #{arsenal.values[cpu]} beats your #{arsenal[player]}!"
      puts "  Victory is mine!!"
      $score[0] += 1
    when [2, "r"], [0, "p"], [1, "s"]
      puts "\n  Oh shame! Your #{arsenal[player]} beats my #{arsenal.values[cpu]}!"
      puts "  You won! Congratulations, I guess."
      $score[1] += 1
    end
  else
    puts "\n  What was that? Repeat, please."
    game(gets.chomp.split("").first.downcase)
  end
  puts "\n  You: #{$score[1]}, me: #{$score[0]} - Rematch? (y/n)"
  init(gets.chomp.split("").first.downcase)
end

welcome