Fireboy and Watergirl 1 Forest Temple diamonds are the colored gems that gate every level exit. Diamonds are split into water-safe gems that only Watergirl can pick up and fire-safe gems that only Fireboy can pick up. Collecting every diamond on a level is required before the twin exit doors open, and collecting every Forest Temple chapter diamond unlocks the perfect ending. Any Steam-specific diamond-rule changes versus the 2009 Flash original are Not announced as of 2026-09-06.
How diamonds gate every Forest Temple level
Every Forest Temple level hides a small set of diamonds across the puzzle layout. The level shows a diamond counter at the top of the screen and a target total; both characters must collect their share of the gems and reach the twin exit doors to clear the level. If either character dies on a hazard (water, fire, green goo, poison pools, lava), the level restarts, but the diamond counter carries over from the previous attempt, so partial progress is preserved within a single play session. Water-safe diamonds are placed on tiles that only Watergirl can stand on. Fireboy who touches a water-safe diamond tile dies on contact, the same way he dies in any water pool. Fire-safe diamonds sit on fire-tinted tiles that only Fireboy can survive. Watergirl who steps on a fire-safe diamond tile dies on contact, identical to her behavior in any fire pool. Some diamond routes cross shared hazards like green goo, poison pools, and lava. Both characters die on these tiles, so neither Watergirl nor Fireboy can stand on them directly. Designers route diamonds across these tiles by placing boxes, levers, and pressure plates that one character can operate while the other collects the gem on the safe side.
Forest Temple perfect ending and the diamond total
The Fireboy and Watergirl 1 Forest Temple perfect ending is unlocked when the chapter diamond total is complete. On the original 2009 Oslo Albet Flash release, that means collecting every diamond in every Forest Temple level. The Steam release on 2026-09-01 (AppID 5084260) reuses the Forest Temple chapter as the launch content, and the diamond-gating rule is the same developer-of-record mechanic that drives level exits. The Steam store page lists Steam achievements for the Forest Temple chapter; the chapter-perfect achievement is unlocked when every diamond on every level has been collected. Specific Steam achievement names, icons, or unlock thresholds beyond what the Steam store page lists are Not announced as of 2026-09-06. Plan a diamond-perfect run by treating each Forest Temple level as two puzzles: the survival puzzle (who crosses which hazard) and the collection puzzle (which character picks up which diamond color).
Steam vs Flash diamond rules
The Forest Temple diamond rule from the 2009 Oslo Albet Flash original is the developer-of-record baseline: water-safe diamonds are cyan, fire-safe diamonds are red, both colors must be collected, and the chapter total unlocks the perfect ending. The Steam release of AppID 5084260 reuses this baseline as the standalone Steam version. Steam additions such as achievements, Steam Cloud, and modern resolution do not change the underlying diamond color rule or the diamond-gating behavior of the level exits. Any Steam rebalancing of the diamond rule is Not announced as of 2026-09-06.
FAQ
How do I unlock the perfect ending?
Collect every diamond (gem) in each Forest Temple level before reaching the exit; water-safe and fire-safe diamonds require Fireboy and Watergirl to work together.