One of the helpful hints that will help you to move ahead faster is the "See Wrong". It will show the wrong letters in red and costs 20 Coins per puzzle.
 
 
Once it's turned ON, it will automatically deduct 20 Coins off your Coin balance per puzzle.
 
 
 
You may choose to turn OFF "See Wrong" by:
 
1. Tapping your Profile.
 
 
2. Tap Settings.
 
 
3. Under Game Settings, search for "See Wrong" stays on.
 
 
4. Toggle the switch to turn See Wrong ON or OFF for Themed, Midi and Mini Puzzles individually.