Player 1 has the easiest job, thinking of a word that can contain all letters. But they must eliminate one of the letters they used. Then player 2 does the same thing, thinking of a word with 25 letters and removes one of the letters which only lefts 24 letters for player 3. It continues this way till there is no more words possible, this can be with 2, 3 or maybe even more letters. If you say a word using one of the eliminated letters you are out for that round. When someone says they can’t make a word anymore after you or if 24 hours have passed that means you win and the next round can start! You can remove letters tactically!
Actual example of how it would look
Hope the game makes sense and works
I start with phone and remove the e abcdfghijklmnopqrstuvwxyz
Dux (I checked an online dictionary and it’s a word, learned something new today ) if I remove the u I will win but since it’s not about winning for me I will remove the d, see if you can still make something up!