The Split Portal Basin

Step-by-step walkthrough

1. Open the blue crossing

   Fireboy walks across the bottom lava to the blue plate on its right. Keep him there while Watergirl walks right through the blue portal. Both heroes continue right along the bottom floor; Fireboy collects the red diamond under the crate shelf.

2. Lower the crate and collect the far-right blue diamond

   Watergirl returns to the left of the crate shelf. Jump straight up, then steer right onto the shelf and push the crate to its sloping right edge. Stop and let it tip and fall, leaving space between it and the far wall. Jump onto it to collect the blue diamond above, then walk all the way to the far-right corner and drop onto the dry bank. Fireboy jumps over the crate to join her. Wait until his feet reach the bank before pushing left.

3. Make a safe step in the lava

   Fireboy pushes the crate left along the bottom floor and into the lava until it sits beneath the opening between the two long shelves. Watergirl returns left to the blue-plate area, jumps up and steers left onto the shelf above it. Walk left off that shelf onto the crate, collecting the blue diamond in the opening, then jump left onto the long wet shelf. Fireboy jumps onto the crate and follows her to that shelf.

4. Climb to the red plate

   Watergirl walks left through her pool, stopping just to the right of the small wall ledge. Jump left onto that ledge, right onto the little red-diamond island, then left to the next wall ledge. From its right edge, jump upward first and start steering right after a brief pause to clear the underside of the upper shelf. Walk onto the red plate and collect the blue diamond above it.

5. Bring Fireboy through the red portal

   Fireboy steps right off the wet shelf into the central opening to collect the remaining lower red diamond. He can land safely in his lava. Jump back onto the crate, then left onto the wet shelf and walk left into the red portal. It carries him to the opening above. Watergirl now steps off the red plate to the left, then steers right while falling to land on the small island below. With the red pair off, Fireboy jumps left from the stone beside its upper opening onto that island and collects its red diamond.

6. Cross the upper basin

   Each hero jumps right from the island through the open gap in the left partition, landing on the small dry shelf beyond it. Jump left onto the top of that partition, then jump right onto the sloped island above the poison basin. Watergirl collects its blue diamond. Walk up the slope before crossing further.

7. Collect the last upper diamonds

   Fireboy jumps right to the middle portal platform, walks across it for the red diamond, jumps right to the next stone island for another red diamond, then jumps to the far-right dry shelf and its yellow lever. Interact once to switch that pair off while Watergirl follows the same island route. She collects the final blue diamond by the far-right wall and turns the lever on as she reaches it. Both heroes now stand beside the handle, and all ten diamonds are collected.

8. Take Fireboy to the ceiling gallery

   Check that the yellow pair glows. Fireboy jumps left to the nearby stone island, then left again into the middle horizontal portal. He appears at the ceiling and falls safely into the exit gallery. Walk right into the red door.

9. Bring Watergirl home

   Watergirl follows the same two leftward jumps into the yellow portal. After falling from its ceiling partner onto the exit gallery, walk left into the blue door.

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.

If you get stuck

For touch controls, jumping, audio, or online connection problems, see player troubleshooting.