Find as many words as you can by connecting the letters on the board. In each round, the letters get hotter, so don't wait too long to use all of them. By forming longer words you can get special ice letters that don't burn to make the game easier.
When you are stuck, you can always shuffle the letters. But beware: Every time you do this, your score decreases, so shuffle wisely.
Fire Words features a huge dictionary of over 70,000 words and you can see your improvements in the highscore list. Fire Words is perfectly suitable for short breaks: You can interrupt your game at any time to continue later exactly where you were.