Order of the Sinking Star Gold Rooms Explained: How All Six Open, the Star Meter, and the 4-of-6 Rule

GameRant's walkthrough hub calls the gold rooms "the game's second layer", and that is the right mental model. The four initial campaigns teach you one ruleset at a time — the Heroes' party pushing, the Trader's mirror swaps, the Sailor's skipping stones, the Explorer's routed light beams. A gold room removes the training wheels: its puzzles run two of those rulesets simultaneously, and the combinations are where the game's real size lives.

Each room takes its name from its parents. HxM fuses Heroes and Mirror Isles; SxB fuses Skipping Stones and Beamcasters, and so on through all six pairings of four worlds. You do not stumble into them early. A gold room is earned twice over — once in each of its parent worlds — which is why so many players walk past a gold door for dozens of hours before it finally opens.

The fastest way to feel the shape of the system is to look at how many players have actually opened each room. These are the "Open the ___ gold room" achievement rates from Exophase's tracked player sample (mid-October 2026) — a difficulty poll voted on by the tracked player base:

Every gold room door is really a checklist written across two worlds. Opening a room requires specific progress in both parent worlds, achieved in a specific order. The detail that breaks players' brains is the second half: steps performed out of order do nothing. A barrier that should drop will sit there, a path that should exist will not — not because you did the wrong thing, but because you did the right thing too early.

This is deliberate design, and it explains most "is this bugged?" posts about gold rooms. The door verifies a sequence that spans two worlds. If a gold room refuses to acknowledge your progress, the missing step is almost never in the world you are standing in — it is in the other parent world, or earlier in the sequence than the step you just completed.

HxM (Heroes × Mirrors, north-east) is the template every other room follows, and the one more than half of tracked players (54.91% in that sample) have opened. Its sequence, in brief:

Opening HxM unlocks the pair's crossover areas: Heroes and Mirrors (seven screens) and Heroes and Water — which is where most players meet the gold-cloak monster rule (a character wreathed in gold can walk on water while a monster's flame is hitting them; our stuck-points coverage takes that rule apart in detail).

A gold room's puzzles light large stars on a 10-star meter, one meter per room. Jonathan Blow described the mechanism before release (via TechRaptor and Game Informer): solving challenges illuminates the big stars, and the meter carries a white line between the 7th and 8th star. Fill the meter past that white line and the room's teleporter to the Antipode powers up.

The liberating consequence: a teleporter does not require finishing every puzzle in its gold room. Roughly the first seven to eight stars' worth of solves is enough to cross the line. The remaining puzzles still count toward your totals — and toward the Completionist achievement — but the room's strategic job is done the moment its teleporter lights. Completionists can mop up afterward; players hunting the first ending should cross the line and move on.

The teleporter is the headline, but opening a gold room also unlocks the corresponding pair's large combination areas — full zones built from both fused systems, and the places most players spend most of their hours. The scale is the story here. The community mapping project wikitactics counts Mirrors and Stones at 49 puzzles across its 37 chambers. Beyond HxB sit the Heroes and Light sets, the largest of the crossover areas in that same mapping: 46 puzzles, plus a 22-puzzle Advanced set.

This is the arithmetic behind the game's "over 1,000 puzzles" official count. The four campaigns are the visible game; the six fusion layers behind the gold rooms are the submerged bulk of it. When a gold room opens, you unlock a second campaign wearing two rulesets at once.

Every gold room's teleporter leads to the same destination: the Antipode, the endgame region. Blow's rule, stated plainly before launch and confirmed by the achievement list since: activating any four of the six teleporters lets you finish the game. The first ending — the one the Endgame achievement marks, at 5.64% of players in the same mid-October sample — deliberately does not ask for all six. Pick the four rooms whose parents you know best, cross their white lines, and go.

Nor is the first ending a point of no return. Play continues afterward: the remaining two rooms and their fused areas stay available, and deeper layers — Antipode High, then Antipode Low, where all six teleporters must be re-activated — hold the second and final endings. The 4-of-6 rule is an exit ramp, not a trapdoor.

By the open rates, the crowd has already voted on a route through the system:

HxM first. Its parents (Heroes, Mirror Isles) are the two gentlest campaigns, its key object and path are the most heavily documented of the six, and 54.91% of tracked players have made it through its door. Then work the Heroes pairings — HxB (29.34%) and HxS (24.28%) — while the north is fresh, with MxB (22.25%) and SxB (17.20%) as the west-heavy midgame. Leave MxS for last. At 13.73% it is the least-opened room in the game, and uniquely it asks you to transport a puzzle object between worlds before its door will even exist — a fitting final exam for the system, and a miserable first one.

Do I need to open all six gold rooms to finish the game? No. The first ending requires any four of the six teleporters. The remaining two rooms stay available afterward, and the deeper endings (via Antipode High and Antipode Low) are where all six eventually matter.

Do I have to solve every puzzle inside a gold room? No. A room's teleporter activates once its 10-star meter passes the white line between the 7th and 8th stars — roughly seven to eight stars' worth of puzzles, not the whole room.

Why is my gold room door not responding? Almost certainly the opening rule: progress in both parent worlds, in the intended order. Out-of-order steps register as nothing at all. Check the parent world you have played less — the missing step lives there more often than not.

Which gold room is easiest, and which is hardest? By player open rates (Exophase tracked sample, mid-October 2026): HxM is the most opened at 54.91%, MxS the least at 13.73%. The rates track how much two-world logistics each door demands, not just puzzle difficulty.

Is there a step-by-step guide to opening HxB? Not a verifiable one, yet. Complete video playthroughs of HxB exist, but no text source documents even one prerequisite step. We would rather tell you that than invent a list.