Few browser games have survived as many generations as Fireboy and Watergirl. The duo showed up in 2009 inside a temple full of lava pools and lakes, and the series has been shorthand for two-player keyboard co-op ever since. Anyone who ever shared a computer with a sibling, a cousin, or a classmate in a school computer lab has probably argued over a badly timed lever at some point.
This guide covers the whole thing: how the games work, all seven titles in release order, and what changes from one temple to the next.
What is Fireboy and Watergirl?
Fireboy and Watergirl is a puzzle-platformer series created by independent developer Oslo Albet. The first title was built in Adobe Flash and later converted to HTML5, which is why the franchise outlived the plugin that killed off most of its contemporaries. Today it runs directly in the browser, on phones, and as paid versions on Steam and mobile app stores.
The premise is easy to explain and hard to master. You control two characters with opposite properties: the fire boy walks through lava unharmed but dies on contact with water; the water girl is the exact reverse. Pools of green goo kill both of them. Every level ends at two doors, one red and one blue, and it only counts as finished when both characters reach the right exit alive.
That one simple restriction has carried the series for more than fifteen years. Neither character can clear a stage alone. One has to hold a button so the other can pass, push a crate to make a step, or wait in exactly the right spot while the other runs.
How to play Fireboy and Watergirl
Controls stay consistent across almost every game in the series:
Fireboy: W, A, and D keys
Watergirl: arrow keys
Beyond reaching the exit, the game asks for two more things from anyone chasing a perfect run: collect every red and blue diamond scattered around the level, and finish under a target time. Diamonds are almost always placed somewhere that requires cooperation, and the clock turns already-solved stages into speed challenges. That is where most of the replay value comes from.
Obstacles are introduced gradually — levers that shift platforms, pressure plates, elevators, fans, mirrors that bounce light beams, ice blocks that melt. Each entry in the series adds a genuinely new mechanic instead of recycling the last one.
Every Fireboy and Watergirl game, in order
1. Fireboy and Watergirl in the Forest Temple (2009)
The game that started it all, released on November 19, 2009. It establishes the foundation: 32 levels, lava, water, green goo, levers, and pushable crates. It is the most straightforward of the bunch and still the best entry point for a first-time player.
2. Fireboy and Watergirl 2: The Light Temple (2010)
The sequel brought light beams, mirrors, and crystals into the mix. Instead of only dodging hazards, you redirect light to trigger mechanisms and open passages. It was the first sign that the formula could be reinvented rather than repeated.
3. Fireboy and Watergirl 3: The Ice Temple (2012)
The ice temple messes with the physics. Floors are slippery, momentum matters, and Fireboy can melt frozen blocks to clear paths or create pools. Plenty of players consider this the hardest chapter in the series.
4. Fireboy and Watergirl 4: The Crystal Temple (2013)
Portals are the headline addition. Stepping into one teleports a character somewhere else on the map, which breaks the linear logic of earlier levels and forces you to hold the whole stage in your head at once. It runs 38 levels.
5. Fireboy and Watergirl 5: Elements (2018)
The fifth game dropped the single-temple structure. It bundles seven elemental temples — fire, water, forest, ice, light, wind, and crystal — revisiting mechanics from earlier entries and adding wind as a new one. It launched in browsers in 2018 and arrived on Steam in January 2019.
6. Fireboy and Watergirl 6: Fairy Tales (2021)
Released in November 2021, this chapter trades the ancient-temple look for a storybook setting and introduces glowing fairies that operate mechanisms the duo can't reach. In practice, you are now coordinating three moving pieces instead of two.
7. Fireboy and Watergirl and Friends (2026)
The most recent chapter landed in May 2026 and is the most demanding in terms of control. The duo gains three new companions, and its 36 levels ask you to manage several characters at once from a single keyboard. A few months later, in September 2026, the first four games were also re-released on Steam, putting the full saga in one place.
Can you play it solo?
Yes, and a lot of people do. Driving both characters with two hands is perfectly manageable in the early levels and turns into a real coordination test by the end. The series has always been designed to work either way: one player with both hands busy, or two players sharing a keyboard.
Co-op is still the better experience, and it explains why the game keeps circulating in schools and among siblings. There is no official online multiplayer — the whole point is having someone sitting next to you.
Why the series is still popular
Fireboy and Watergirl has aged well for concrete reasons. No install, no account. It runs on almost any old computer. The core rule is understood in ten seconds without a tutorial. And it solves a rare problem: it is one of the few co-op games that actually works when the two players have completely different skill levels on the same device.
While most Flash classics disappeared along with the plugin, this series was ported to HTML5 and is still getting new chapters nearly two decades after the first temple.
Frequently asked questions
How many Fireboy and Watergirl games are there? The official series has seven games: Forest Temple, Light Temple, Ice Temple, Crystal Temple, Elements, Fairy Tales, and and Friends.
What order should I play them in? Release order is the way to go, since each title assumes you already understand the mechanics of the last one. Start with the Forest Temple.
Who made Fireboy and Watergirl? Independent developer Oslo Albet, who is behind every game in the series.
Is Fireboy and Watergirl free? The browser versions are free. Steam and the mobile app stores sell paid versions, either individually or bundled as the complete saga.
Which game in the series is the hardest? There is no consensus, but the Ice Temple usually gets the vote, thanks to slippery floors that make precise positioning much harder.