What is Gem Mahjong: Chains of Andromeda?
Gem Mahjong: Chains of Andromeda is a free online gem tile-matching puzzle. Fifteen sacred gems have been scattered through four sunken chambers of an Aegean palace, and you lift them back onto Athena’s Aegis two at a time until the shield is whole and Princess Andromeda is freed from the sea-cliff. The formula is the classic mahjong-solitaire peel — a tile can only be lifted when nothing covers it — rebuilt for short, relaxing mobile sessions with a tide tray that punishes hoarding.
Each chamber is a marble pile of stacked gem tiles. Clear the top of the pile, reveal the layer beneath, and keep your tray from drowning in unmatched gems. Thirty handcrafted chambers run from a twelve-tile slab in the Tidal Baths to a seventy-six tile shield mosaic in the final chamber, across four acts of a Greek-myth story, plus an endless descent that gets deeper and meaner with every wave.
How to Play
- Tap a free gem tile. A tile is free when nothing rests on it. It rides down into the tide tray at the bottom of the screen.
- Tap its twin. A second tile showing the same gem completes the pair: both are set into the Aegis and disappear from the tray.
- Watch the tray. It holds seven gems (nine once you buy the extra grooves). Fill it with no match and a twelve-second tide clock begins; let it run out and the chamber is lost.
- Work the marks. From Act III, Cetus-marked gems cannot ride in the tray at all — they only lift when their twin is already in the tray or free on the board.
- Clear the pile. Every gem set into the Aegis is one more seal broken. Finish the chamber with time to spare to earn three stars.
Rules at a Glance
| Rule | Detail |
|---|---|
| Free tile | Nothing rests on it — no tile on the layer above overlapping it |
| Match | Two tiles showing the same gem; the pair leaves the tray immediately |
| Tide tray | 7 grooves, or 9 after buying both Workshop upgrades |
| Tide clock | A full tray starts a 12-second countdown; zero ends the chamber |
| Cetus-marked gems | Cannot be carried — lift only when the twin is in the tray or free |
| Tide Pearls | Matching a pair adds 8 seconds and one free power-up charge |
| Power-ups | Magnet, Sweep, Shuffle, Aegis Glance — charges vary by act |
| Stars | 40% of the chamber clock left: ★★★ · 15%: ★★ · otherwise ★ |
Why Gem Mahjong Stands Out
| Feature | Gem Mahjong: Chains of Andromeda | Typical tile-match games |
|---|---|---|
| Story | Four-act Greek myth with interludes and an ending | Level numbers only |
| Chambers | 30 handcrafted piles + endless descent waves | Random or unlocked sets |
| Gem art | 15 gems drawn from scratch with Canvas paths | Emoji or stock sprites |
| Challenge | Layered piles, tide tray, Cetus marks, timer | Untimed, no fail state |
| Fairness | Every chamber is generated from a verified solution | Often unwinnable by luck |
| Progress | Stars buy real tray upgrades; saved in your browser | Ad-gated extras |
Frequently Asked Questions
What is Gem Mahjong: Chains of Andromeda?
Gem Mahjong: Chains of Andromeda is a free online gem tile-matching puzzle. Fifteen sacred gems have been scattered through four sunken chambers of an Aegean palace, and you lift them back onto Athena's Aegis two at a time until the shield is whole and Princess Andromeda is freed from the sea-cliff.
How do I play Gem Mahjong?
Tap a gem tile that has nothing resting on it — it rides down into the tide tray at the bottom of the screen. Tap a second tile showing the same gem and the pair is set into the Aegis and disappears. Clear every tile on the pile to finish the chamber.
What happens when the tide tray fills up?
The tray holds seven gems, and any gem you leave in it is one the sea may claim. Once the tray is full you have twelve seconds to make a match, sweep the tray back onto the pile, or use a power-up; if the clock runs out, the tide takes the tray and the chamber ends.
What are Cetus-marked gems?
From Act III the beast marks some gems with its sigil. A marked gem cannot ride in the tray, so it may only be lifted when its twin is already in the tray or free on the board. Marked gems must effectively be cleared in pairs, which is where most of the late-game planning comes from.
Which power-ups are there in Gem Mahjong?
There are four. Magnet tears the buried twin of a tray gem straight out of the pile and matches it. Sweep returns every gem in the tray to its place on the pile. Shuffle re-deals the gems still on the board. Aegis Glance links every remaining pair with a line of shield-light for twelve seconds.
Is Gem Mahjong free and can I play it on my phone?
Yes. Gem Mahjong: Chains of Andromeda is completely free, needs no download or sign-up, and runs in any modern browser on desktop, tablet and mobile with full touch support. Progress and stars are saved in your browser.
Technical Notes
The whole game is a single self-contained page: the fifteen gems are drawn with Canvas paths, all sound is synthesized with WebAudio, and every chamber is generated from a recorded, verified solution — so no chamber can ever be impossible to clear. Piles are built from layout masks, gems are dealt from the solution order, and the result is deterministic from the chamber number. There is no download, no account and no tracking beyond an anonymous page counter.