Source code in the brat programming language

number = random 10

p "Guess a number between 1 and 10."

until {
  guess = ask("Guess: ").to_i

  true? (guess.null? || { guess > 10 || guess < 1 })
    { p "Please guess a number between 1 and 10."}
    { true? guess == number
      { p "Correct!"; true }
      { true? guess < number
        { p "Too low!" }
        { p "Too high!" }
      }
    }
}