Here is an example of a gist guessing game using a while loop....

gistfile1.rb

secret = rand(100)

print "Enter a number..."

while secret != (input = gets.chomp.strip.to_i)
  puts "Wrong. Guess again..."
  if secret > input
    puts "I'll give you a clue... its higher..."
  else
    puts "I'll give you a clue... its lower..."
  end

end

puts "You got it right..."