Fireboy & Watergirl
Friends · LEVEL 13 · Verified walkthrough
The Heavy and the Small
Use the heavy friend as a moving stepping stone across water. The small friend opens the low passages, while Watergirl reaches the high orange lever. Gather the lower diamonds before both heroes climb from the heavy friend to their exits.
Level objective
Bring Fireboy to the orange exit in the lower right and Watergirl to the blue exit in the lower right. Both heroes must be at their own doors together. The 8 unmarked diamonds are optional; collect every diamond for a perfect clear.
| Campaign | And Friends · 13 of 36 |
|---|---|
| Collectibles | 4 fire diamonds, 4 water diamonds. 0 marked diamonds required; 8 optional. |
| Hazards | 1 lava pool, 2 water pools, 3 purple goo pools. Only your own element is safe; purple goo is dangerous to both. |
| Mechanisms | 5 plates, 1 lever, 6 moving platforms |
| Win condition | Bring Fireboy to the orange exit in the lower right and Watergirl to the blue exit in the lower right. Both heroes must be at their own doors together. The 8 unmarked diamonds are optional; collect every diamond for a perfect clear. |
| Exits | Fireboy: lower right. Watergirl: lower right. |
Step-by-step walkthrough
Carry Fireboy across the first pool
Move the heavy friend right off the starting ledge and into the water below. Fireboy steps off onto its head. Carry him towards the right bank, then jump from the friend onto the dry shelf for the first red diamond.
Collect the first blue diamond
Watergirl steps left off her starting floor into the same water pool. Jump out at the left bank and collect blue on the dry shelf.
Open the yellow passage
Fireboy drops around the right end of the shelf into the lava below. Move close to its left lip before jumping left onto the yellow plate. Stay there to move the yellow platform aside.
Send the small friend to green
Bring the small friend down from its starting floor and jump out of the first pool on the right. Drop around the right end of the shelf onto the extended yellow platform. Walk left through the opened gap, drop onto the lower floor, cross its water pool and hold the green plate at the far left.
Collect the next red diamond
The heavy friend crosses back through the first pool, jumps out at the left and drops through the green opening. Walk right around the short ledge into the second water pool. Fireboy descends to the pool’s right bank, jumps onto the friend and rides towards the left bank. Jump off for the red diamond.
Bring Watergirl to the lower route
Watergirl drops through the green opening, walks around the short ledge and crosses the second water pool. Jump out on its right bank.
Open the pink gate
Watergirl drops from the right end of the floor and jumps across the short purple pool. The small friend follows, passes beneath the low pink gate and holds its plate on the right. Watergirl can now walk through.
Reach the orange lever
Move Watergirl to the right of the middle shelf before jumping up and steering left onto it. Collect blue, then jump up and right onto the next shelf. Walk past the orange lever to open the lower-left descent.
Take Fireboy to the bottom
Fireboy jumps back onto the heavy friend to cross the second water pool. Drop from the right end of the floor, then walk left through the orange passage to the lower ledge. Jump left across its purple pool and drop around the left edge for the low red diamond.
Hold the white plate
Fireboy jumps right across the bottom purple pool and holds white. Bring the heavy friend through the orange passage, then through the open white gate. Drop around the lower ledge’s right edge and move to the bottom-right side.
Gather Watergirl’s remaining diamonds
Watergirl comes down around the right-hand shelves and crosses back through the pink gate. Jump left across purple and descend through the orange passage. Cross the white gate and jump from the lower ledge’s right edge for blue. On the bottom floor, jump left across purple for the far-left blue diamond, then jump back to the right.
Open the blue exit passage
The small friend leaves pink, jumps left across the purple pool and takes the orange and white passages to the bottom floor. Hold the blue plate at the far right. Fireboy can leave white and jump for the last red diamond above the bottom floor.
Climb from the heavy friend
Place the heavy friend beneath the left tip of the exit ledge. Each hero jumps onto its head, jumps upward before steering right onto the sloped tip, then jumps onto the flat exit floor.
Finish together
Fireboy enters the red door and Watergirl enters the blue door. Either hero can arrive first. Keep the small friend on blue until both have crossed the opened passage.
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 left
Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.
Controls Moving platform 1.
Switch 2
middle 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 right
Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.
Controls Moving platform 3.
Switch 4
middle right
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 center
Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.
Controls Moving platform 5.
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 6.
Moving platform 1
middle left
At least one of these inputs must be active: Switch 1.
When powered, it moves right; when power is released, it returns.
Moving platform 2
middle center
At least one of these inputs must be active: Switch 2.
When powered, it moves right; when power is released, it returns.
Moving platform 3
middle right
At least one of these inputs must be active: Switch 3.
When powered, it moves up; 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 left; when power is released, it returns.
Moving platform 5
lower center
At least one of these inputs must be active: Switch 5.
When powered, it moves down; when power is released, it returns.
Moving platform 6
lower right
At least one of these inputs must be active: Switch 6.
When powered, it moves down; when power is released, it returns.
If you get stuck
Check the unfinished objective
The diamonds in this room are optional. If you only want to finish, bring both heroes fully inside their own matching doors.
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 and the Small?
Use the heavy friend as a moving stepping stone across water. The small friend opens the low passages, while Watergirl reaches the high orange lever. Gather the lower diamonds before both heroes climb from the heavy friend to their exits. Bring Fireboy to the orange exit in the lower right and Watergirl to the blue exit in the lower right. Both heroes must be at their own doors together. The 8 unmarked diamonds are optional; collect every diamond for a perfect clear.
How many diamonds are required in The Heavy and the Small?
8 diamonds: 4 for Fireboy and 4 for Watergirl. None are required to finish. 8 unmarked diamonds are optional collectibles for a perfect clear.
Which hazards are in The Heavy and the Small?
1 orange lava pool (middle center), 2 blue water pools (upper center and middle center), and 3 purple goo pools (middle center, lower center, and lower left). 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 and the Small?
Switch 1 (middle left): Controls Moving platform 1. Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it. Switch 2 (middle 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 right): Controls Moving platform 3. Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it. Switch 4 (middle right): 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 center): Controls Moving platform 5. 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 6. Keep a hero or movable weight on this plate to keep its signal active. Stepping off releases it.