Fireboy & Watergirl 3 in The Ice Temple is the third game in the series.
The release date was April 5, 2012.
The main menu.
There are 37 levels, consisting of 20 normal levels, 6 simultaneous designed levels, and 11 white diamond levels. In a normal level there will be various puzzles to solve, such as levers, pushers, boxes, light detectors and mirrors, the newly introduced ice/snow and freeze/melt lights, etc. and a few diamonds to collect, though not necessary to complete the level, it will increase your rating at the end. In simultaneous designed levels both characters should be moved at the same time symmetrically, usually there is not much puzzles and only obstacles. In a white diamond level there is only one diamond that must be collected in order to pass the level, pretty much the same as a normal level but with only one diamond which is needed to complete the level.
The level select.
There are two characters, Fireboy and Watergirl. Fireboy can walk in lava but cannot walk in water or green goo, he slides on ice and snow but cannot climb up snowy slopes. Watergirl can walk in water but cannot walk in lava or green goo, she is slowed by ice and snow but can climb up snow slopes.
The Ice Temple may be considered the most difficult out of all of the temples mostly due to the extremely difficult levels.
Fireboy & Watergirl 3 in The Ice Temple Sample Gameplay