Fireboy & Watergirl 4 in The Crystal Temple is the fourth game in the series.
History
It was first announced on the official twitter on March 8, 2013, in the tweet simply saying, "Ready for new adventures?" implying that there would be a fourth installment to the series. 12 days later, there would be another announcement, implying that "FireBoy and WaterGirl are coming soon." Then, on March 22, 2013, they would show the date of its debut. The Crystal Temple was then officially launched on March 29, 2013, and was first on a10.com.
In-Game Contents
The main menu.
There are 39 levels, consisting of 25 normal levels, 5 simultaneous designed levels, and 9 white diamond levels. In a normal level, there will be various puzzles to solve, such as levers, pushers, boxes, light detectors and mirrors, ice/snow and freeze/melt lights, the newly introduced crystal teleporters, 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 are not many puzzles and only obstacles. In a white diamond level, there is a white diamond that must be collected in order to complete the level, alongside regular red and blue diamonds in order to increase the rating, pretty much the same as a normal level but there is one diamond that must be collected to pass.
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.
Fireboy & Watergirl 4 in The Crystal Temple Sample Gameplay