Fireboy and Watergirl element rules and traps split the survival mechanics by character. Fireboy dies on contact with water pools, and Watergirl dies on contact with fire pools. Both characters die on contact with green goo, poison pools, and lava. Pressure-plate doors and boxes let the two characters cooperate to bypass hazards that neither can stand on alone. The Steam release on 2026-09-01 (AppID 5084260) reuses these rules from the 2009 Oslo Albet Flash original.
Per-character element rules
Every Fireboy and Watergirl element trap is built from the same baseline: each character has one element they cannot survive, and three shared hazards that kill both. Fireboy dies the moment his feet touch any water pool. Water pools come in two forms: standing water on the floor of a level, and water-safe diamond tiles. Fireboy cannot stand on either. Designers place water pools as the route Watergirl must take to reach water-safe diamonds; Fireboy waits on the safe side until Watergirl clears the path. Watergirl dies on contact with any fire pool. Fire pools include standing fire on the floor and fire-safe diamond tiles. Watergirl cannot stand on either. Designers mirror the layout so Fireboy crosses the fire pools to collect fire-safe diamonds while Watergirl waits on the safe side. Green goo is the slimy green puddle that both Fireboy and Watergirl die on. Poison pools are the dark-purple water that both characters die on. Lava is the bright-orange floor that both characters die on. Because neither character can survive these three hazard types, the only way past them is to operate boxes, levers, elevators, or pressure plates that one character holds while the other character crosses the safe tile.
Cooperative triggers and pressure-plate doors
Many Fireboy and Watergirl element traps are solved by simultaneous-button cooperative triggers. A pressure plate on the floor opens a door only while a character stands on the plate. If one character needs to cross a door that closes behind them, both characters step on two plates at the same time, the door opens, both characters run through, and the door closes again before either character falls into the hazard behind. Boxes can be pushed into water pools, fire pools, green goo, poison pools, and lava to create a temporary safe tile. Levers held down by a box open doors or elevators that stay open while the box sits on the lever. Designers use these so that one character pushes a box onto a lever while the other character crosses the safe tile to reach the exit door. Some Forest Temple traps require both characters to step on two separate pressure plates at the same time. One plate opens the exit door; the other plate opens the path to the exit door. The rule is the same: both characters step on the plates together, the doors open, and both characters must reach the exit door before the doors close again.
Element rules as the per-level puzzle language
Fireboy and Watergirl element rules are not just survival mechanics; they are the design language that decides where diamonds and exit doors can sit on every Forest Temple level. Water-safe diamonds sit on water-safe tiles that only Watergirl can stand on. Fire-safe diamonds sit on fire-safe tiles that only Fireboy can stand on. Diamonds are never placed directly on green goo, poison pools, or lava; they sit on safe tiles, but the safe tile is only reachable through a cooperative trigger across the unsafe tile. Every Forest Temple level uses a small subset of the five element types to build its puzzle: water pools, fire pools, green goo, poison pools, and lava. Early levels mix only water and fire so new players can learn the character split. Later levels introduce green goo and poison pools to force cooperative triggers. Final levels stack lava on top of water-safe and fire-safe routes so both characters must operate boxes and pressure plates in sequence before either can cross.
Steam vs Flash element-rule parity
The Forest Temple chapter element rules on the Steam release of AppID 5084260 are described as the standalone Steam version of the 2009 Oslo Albet Flash original. Steam additions (Steam achievements, Steam Cloud, modern resolution, controller support) do not change the underlying element rules. Any Steam-specific rebalancing of the five hazard types is Not announced as of 2026-09-06.
FAQ
What are the element trap rules?
Fireboy fears water, Watergirl fears fire, and both characters fear green goo, poison pools, and lava; simultaneous-button cooperative triggers require both characters on switches at the same time.