Fireboy and Watergirl are back to explore a new temple and they will have to work together again to solve the puzzles, collect all the diamonds and reach the doors corresponding to their symbol.
This episode takes place in the universe of fairy tales and you will therefore have to use them to help you activate the various mechanisms.
Some basic principles to remember: Never mix water and fire, use fairies of the right color (knowing that white fairies can activate all colors).
See also:
Other games from the "Fireboy & Watergirl" series