Nice job on the non-repeating random numbers in Swift 4.2!

let sequence = 1 ..< 27
        let shuffledSequence = sequence.shuffled()
        print (shuffledSequence)

Wow now it is so easy! Two lines of code. No more shuffling arrays, or writing C scripts.

For me, Non-repeating random numbers are the basis of all my games.

From chess puzzles to map making. Finally, an easy solution.

Thannks for the update.