Fireboy & Watergirl
Friends · LEVEL 21 · Verified walkthrough
The Heavy Diamond Vault
Use the heavy friend to reach the yellow lever, then collect the upper diamonds before descending. At the bottom, the friend operates the orange shuttle while the heroes cross the purple goo. Hold the aqua plate so Watergirl can ride the fan to the neutral diamond, then return together to the exits.
Level objective
Collect all 9 ring-marked diamonds, then bring Fireboy to the orange exit in the lower right and Watergirl to the blue exit in the middle right. Both heroes must be at their own doors together.
| Campaign | And Friends · 21 of 36 |
|---|---|
| Collectibles | 4 fire diamonds, 4 water diamonds, 1 neutral diamonds. 9 marked diamonds required; 0 optional. |
| Hazards | 1 lava pool, 2 water pools, 1 purple goo pool. Only your own element is safe; purple goo is dangerous to both. |
| Mechanisms | 5 plates, 1 lever, 5 moving platforms, 1 fan |
| Win condition | Collect all 9 ring-marked diamonds, then bring Fireboy to the orange exit in the lower right and Watergirl to the blue exit in the middle right. Both heroes must be at their own doors together. |
| Exits | Fireboy: lower right. Watergirl: middle right. |
Step-by-step walkthrough
Raise the heavy friend
Fireboy jumps left from the middle floor, collects its red diamond and jumps right onto the white plate’s shelf. Hold white to raise the heavy friend. Watergirl jumps left from her starting shelf, follows the middle route and takes over the white plate.
Open the green passage
Fireboy jumps from the white shelf onto the upper lava pool and collects its red diamond. Jump out at the pool’s left bank, then jump up and right onto the green plate’s roof. Keep green held while the heavy friend crosses left through its gate and drops onto the upper-left water pool.
Collect the high red diamond
With the heavy friend safely left of the green gate, Fireboy walks up the roof’s right-hand slopes for the high red diamond. Return to the green plate and wait there.
Lower the pink lift
The heavy friend jumps out of the left water pool and holds the pink plate. Watergirl leaves white, returns along the middle floor and collects the blue diamond above its water pool. Jump onto the lowered pink lift beside the far-left wall.
Reach the high blue diamond
Move the heavy friend off pink. Once Watergirl’s lift reaches the upper floor, jump up before steering right onto the narrow stone pillar. Jump right for the high blue diamond and land on the pink plate’s shelf.
Reach the yellow lever
Park the heavy friend in the upper water pool, below and left of the yellow lever’s ledge. Watergirl walks into the pool and jumps straight onto the friend’s head. Jump upward again, then steer right onto the high ledge and walk across the yellow lever.
Return to the right-hand roof
The yellow lift lowers. Watergirl drops left from the lever ledge into her water pool, jumps out at its right bank and walks onto the lowered yellow lift. Jump up and right onto the dry bank beside the lava, then jump onto the green roof.
Collect the blue diamond above white
Fireboy keeps green held while Watergirl crosses the upper-right roof and passes through the lowered green gate. Drop onto the white lift and jump for the high blue diamond. Jump back left onto the roof and return to green.
Bring the friend to the bottom
The heavy friend jumps out of the upper-left water pool, crosses the lowered yellow lift and walks right along the middle floor. Drop onto the right-hand exit shelf, then walk left off that shelf to the bottom floor. Wait near the orange plate.
Take Fireboy across the bottom goo
Fireboy drops onto his upper lava pool, jumps out at its right bank and descends through the right-hand shelves to the bottom. Move the friend off orange so the shuttle returns right. Fireboy jumps onto the shuttle for the red diamond; the friend holds orange to carry him left. Jump onto the dry left bank and hold the aqua plate.
Bring Watergirl to the bottom
Watergirl drops left from the green roof onto the dry bank beside the lava. Step left onto the yellow lift, then descend onto the middle floor. Jump right onto the white plate’s shelf. Step off its left edge, steer right while falling, and drop from the lower shelf to the bottom floor. Fireboy keeps aqua held.
Carry Watergirl across
Move the friend off orange to bring the shuttle right. Watergirl jumps aboard; the friend holds orange again to move her left. Walk across the shuttle for the blue diamond, then jump onto the left bank.
Ride the fan for the neutral diamond
Fireboy stays on the aqua plate. Watergirl walks into the far-left airflow and rises to the neutral diamond below the stone ceiling. Steer right out of the fan and return to the dry left bank. The neutral diamond can be collected by either hero or a friend.
Return both heroes across the goo
Fireboy leaves aqua. Both heroes jump from the left bank onto the orange shuttle. Move the heavy friend off orange and wait for the platform to reach the right bank. Jump both heroes onto dry land.
Climb to the matching exits
Jump up before steering right onto the lower exit shelf. Fireboy enters its red door. Watergirl jumps left from that shelf onto the middle floor and enters the blue door. Either hero can enter first; the heavy friend stays safely on the bottom floor.
This route was verified in the game simulation using player controls, required diamonds, and both matching exits. It describes this version’s independently reconstructed room, not an official walkthrough.
How this room’s mechanisms work
Switch 1
middle right
Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.
Controls Moving platform 1.
Switch 2
upper center
Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.
Controls Moving platform 2.
Switch 3
middle left
Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.
Controls Moving platform 3.
Switch 4
upper center
Walk past the handle, or use it nearby: Enter for Fireboy, E for Watergirl, or the touch Use button. Each use toggles it; it stays set after you leave.
Controls Moving platform 4.
Switch 5
lower left
Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.
Controls Fan 1.
Switch 6
lower right
Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.
Controls Moving platform 5.
Moving platform 1
upper right
At least one of these inputs must be active: Switch 1.
When powered, it moves up; when power is released, it returns.
Moving platform 2
upper right
At least one of these inputs must be active: Switch 2.
When powered, it moves down; when power is released, it returns.
Moving platform 3
middle left
At least one of these inputs must be active: Switch 3.
When powered, it moves down; when power is released, it returns.
Moving platform 4
middle center
At least one of these inputs must be active: Switch 4.
When powered, it moves down; when power is released, it returns.
Moving platform 5
lower center
At least one of these inputs must be active: Switch 6.
When powered, it moves left; when power is released, it returns.
Fan 1
lower left
At least one of these inputs must be active: Switch 5.
The air current pushes up. Stay in the stream until you can move onto a dry landing.
If you get stuck
Check the unfinished objective
Count the ring-marked diamonds still visible. All 9 are required before both matching doors can finish this room; each hero collects their own color.
A gate or platform moved back
A pressure plate releases when its rider or weight leaves. Keep your partner on it until you are safely across. Levers stay set after you leave; check their ON or OFF state before crossing.
You missed a moving platform
Return to safe ground and use the connected switch to bring it back. Board before your partner releases the plate or changes the lever. Avoid jumping into its underside; line up with the open shaft first.
You cannot recover safely
Pause and choose Restart level to reset both heroes, diamonds, weights, and switches. Previously completed levels stay saved. Follow the step order before moving a box or releasing a weight.
For touch controls, jumping, audio, or online connection problems, see player troubleshooting.
Level questions
How do you finish The Heavy Diamond Vault?
Use the heavy friend to reach the yellow lever, then collect the upper diamonds before descending. At the bottom, the friend operates the orange shuttle while the heroes cross the purple goo. Hold the aqua plate so Watergirl can ride the fan to the neutral diamond, then return together to the exits. Collect all 9 ring-marked diamonds, then bring Fireboy to the orange exit in the lower right and Watergirl to the blue exit in the middle right. Both heroes must be at their own doors together.
How many diamonds are required in The Heavy Diamond Vault?
9 diamonds: 4 for Fireboy, 4 for Watergirl, and 1 for either hero. 9 ring-marked diamonds are required to finish.
Which hazards are in The Heavy Diamond Vault?
1 orange lava pool (middle center), 2 blue water pools (middle center and middle left), and 1 purple goo pool (lower center). Fireboy can enter orange lava; Watergirl must avoid it. Watergirl can enter blue water; Fireboy must avoid it. Purple goo defeats either hero. If either hero falls into a dangerous pool, both players restart the level.
What do the switches do in The Heavy Diamond Vault?
Switch 1 (middle right): Controls Moving platform 1. Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it. Switch 2 (upper center): Controls Moving platform 2. Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it. Switch 3 (middle left): Controls Moving platform 3. Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it. Switch 4 (upper center): Controls Moving platform 4. Walk past the handle, or use it nearby: Enter for Fireboy, E for Watergirl, or the touch Use button. Each use toggles it; it stays set after you leave. Switch 5 (lower left): Controls Fan 1. Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it. Switch 6 (lower right): Controls Moving platform 5. Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.