The MxS Gold Room is the gold platform in the south-east where The Mirror Isles and Skipping Stones to Lonely Homes meet. Solving it opens the MxS Gold Room, unlocks the Gold MxS achievement and gets you into Mirrors and Stones.
Inside the MxS gold room, with the mirror on the Trader's island and the skipping stones on the Sailor's side.
Who is where
The Trader starts on the left with the mirror. The Sailor is on the right with the skipping stones.
Solution
- Move the Sailor with the mirror. Use the mirror to put her onto the lily pads on the second island.
- Hand the pink stone over. Skip the pink stone back to the Trader so he can skip it toward a lily pad. The ripple carries her down to the third island in the bottom left.
- Send the other stone up. Push the other stone up to the Trader.
- Build the bridge. Drop the mirror into the water on his island and push the pink stone on top of it to make a platform. That bridges the gap to his end position.
- Finish. The Sailor ends on the third island, underneath where the stone was.
Solution notes adapted from the Postmode walkthrough video (PS5 Pro, no commentary) and checked against the footage. Press undo and compare with the video if a step does not match your screen.