Ty for feedback i appreciate it.
True letter clue may be to overpowered, mby i can put it as last clue or even limit it on weekly base to have certain amount.
Regarding colors you can see here what each color means https://guessful.com/about.
And for ranking i already have it but it is only for logged users, i don't know the way to store scores for guests. You can see leaderborad here https://guessful.com/leaderboard