Fireboy & Watergirl

Crystal · LEVEL 20 · Verified walkthrough

The Four-Way Crossing

Use the purple pair to reach the top, the green and white floor crystals to explore both left shafts, and the yellow pair to reach the doors. Collect all fourteen diamonds while crossing only your own elemental pools.

Level objective

Bring Fireboy to the orange exit in the middle right and Watergirl to the blue exit in the middle right. Both heroes must be at their own doors together. The 14 unmarked diamonds are optional; collect every diamond for a perfect clear.

The Four-Way Crossing, crystal level 20: actual game view with Fireboy, Watergirl, diamonds, elemental pools, matching exits, and this level’s mechanisms.
The level at its starting positions. Orange is safe for Fireboy; blue is safe for Watergirl; purple goo is dangerous to both.
Level at a glance
CampaignThe Crystal Temple · 20 of 39
Collectibles7 fire diamonds, 7 water diamonds. 0 marked diamonds required; 14 optional.
Hazards2 lava pools, 3 water pools, 3 purple goo pools. Only your own element is safe; purple goo is dangerous to both.
Mechanisms8 portals
Win conditionBring Fireboy to the orange exit in the middle right and Watergirl to the blue exit in the middle right. Both heroes must be at their own doors together. The 14 unmarked diamonds are optional; collect every diamond for a perfect clear.
ExitsFireboy: middle right. Watergirl: middle right.

Step-by-step walkthrough

  1. Visit the upper purple pair

    Take one hero around the room while the other waits safely at the start. Fireboy drops to the bottom corridor and collects its red diamond. Walk into the purple crystal to reach the top walkway. Collect the upper diamond of your element, moving clear of the receiving crystal before approaching it again. Watergirl also follows the walkway left to its pointed end and jumps for the blue diamond beyond it.

  2. Explore the upper middle walkway

    From the top walkway, drop around its right end to the ledge below. Fireboy jumps over the purple pool and collects the red diamond above its left edge. Watergirl jumps over red pools; Fireboy jumps over blue pools. Return through the purple pair when you need to reach the bottom corridor again.

  3. Drop through the green floor crystal

    At the bottom, jump over the purple pool to the small stone lip beside the green crystal. Fireboy collects the nearby red diamond. Drop into the green crystal to emerge at the top of the far-left shaft. Stay inside the shaft during the fall: Fireboy collects its upper red diamond and Watergirl its lower blue diamond. Land on the left walkway below.

  4. Cross the lower passages

    Follow the sloping walkway to the right. Watergirl jumps onto the small blue pool shelf for its diamond and collects the diamond near the bottom-right ramp. Fireboy reaches the red pool shelf for its diamond, jumping over the blue pool beneath it. Use the solid ends of each shelf when crossing between levels.

  5. Drop through the white floor crystal

    Continue around the right end of the lower walkway to the white crystal in the bottom-right corner. It sends you down the second shaft on the left. Watergirl collects the high blue diamond and Fireboy the red diamond farther down. Land on the sloping middle passage; Watergirl also collects the blue diamond along its central stretch.

  6. Reach the yellow crystal and the exits

    Climb left around the end of the higher middle walkway, then follow it right to the yellow crystal. Enter it to emerge beside the far-right exit passage. Drop onto the door platform and stop at the matching door. Repeat with the waiting hero; the full route collects seven diamonds of each element.

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

  • Portal 1

    lower center

    This portal needs no switch power.

    Step inside to travel to Portal 2. Step out of the destination before trying to return.

  • Portal 2

    upper right

    This portal needs no switch power.

    Step inside to travel to Portal 1. Step out of the destination before trying to return.

  • Portal 3

    lower right

    This portal needs no switch power.

    Step inside to travel to Portal 4. Step out of the destination before trying to return.

  • Portal 4

    upper left

    This portal needs no switch power.

    Step inside to travel to Portal 3. Step out of the destination before trying to return.

  • Portal 5

    upper left

    This portal needs no switch power.

    Step inside to travel to Portal 6. Step out of the destination before trying to return.

  • Portal 6

    lower right

    This portal needs no switch power.

    Step inside to travel to Portal 5. Step out of the destination before trying to return.

  • Portal 7

    middle right

    This portal needs no switch power.

    Step inside to travel to Portal 8. Step out of the destination before trying to return.

  • Portal 8

    middle left

    This portal needs no switch power.

    Step inside to travel to Portal 7. Step out of the destination before trying to return.

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.

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 Four-Way Crossing?

Use the purple pair to reach the top, the green and white floor crystals to explore both left shafts, and the yellow pair to reach the doors. Collect all fourteen diamonds while crossing only your own elemental pools. Bring Fireboy to the orange exit in the middle right and Watergirl to the blue exit in the middle right. Both heroes must be at their own doors together. The 14 unmarked diamonds are optional; collect every diamond for a perfect clear.

How many diamonds are required in The Four-Way Crossing?

14 diamonds: 7 for Fireboy and 7 for Watergirl. None are required to finish. 14 unmarked diamonds are optional collectibles for a perfect clear.

Which hazards are in The Four-Way Crossing?

2 orange lava pools (upper center and middle right), 3 blue water pools (middle center, lower center, and lower right), and 3 purple goo pools (upper right, lower center, and lower right). 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.

Does The Four-Way Crossing need a partner to hold a switch?

There are no levers or pressure plates in this room. Each hero can follow their own route, but both matching exits are still needed to finish.