They all have the same principle: a five by five crossword grid contains six five-letter words, but no clues are given as to as to what the words might be other than their vowels.
Version one. The vowels of the words are put in their correct places. You have to guess the words from this.
Version two. As version one, but you're also told what consonants are present. You're not told how many times each one appears.
Version three. As version two, but you are told how many times each consonant appears.
Which of these do you prefer, or are they all rubbish?