Spot the missing die face as quickly as possible. Micro game in Ruby.

noshowdieface.rb

# No-Show Die Face, a micro game in Ruby 

r = 0
e = false
s = Time.now.to_f

begin

  # die faces 1 to 6
  n = { 1 => "\u2680", 
        2 => "\u2681", 
        3 => "\u2682", 
        4 => "\u2683", 
        5 => "\u2684", 
        6 => "\u2685" }

  t = Time.now.to_f
  d = rand(1..6)

  n.delete(d)  
  
  # show permutated die faces
  (1..6).to_a.shuffle.each {|i| print n[i]; }


  print " Missing?"
  a = gets.to_i

  puts

  r += 1
  q = (Time.now.to_f - t).round(3)

  if a == d then 
    print "Yes! Time: #{q}\n" 
  else 
    puts "Wrong!"
    e = true
  end;

end while !e and q < 3 

print "You're not quick enough!\n"
print "#{r} round(s) in #{ (Time.now.to_f-s).round(3) }s"