Mahjong Wins Super Scatter
Sunken City Riches
Sunken City Riches Stats
RTP & Maths
- RTP by Mode
- Super Stake 96.01% · Buy Free Spins 96.01%
- Max Win Rule
- Win cap of 15,000x the bet for both regular play and free spins
Free Spins & Bonus
- Free Spins
- 3/4/5 Free Spins Scatters = 8/10/12 Free Spins (only the highest applicable number awarded); retriggers 3/4/5 Scatters = 3/4/5 additional Free Spins
- Bonus Buy
- Buy Free Spins 100x (96.01% RTP) · Super Stake (50% of the base game bet) (96.01% RTP)
- Multipliers
- Treasure Map values 3x to 1000x (paid in the Mystery Pick); Wild multipliers x1 to x5 · Treasure Map Scatter values are collected in the Gem Meter and only paid during the Mystery Pick Bonus (award = total multiplier x bet). Add Wild Multipliers places 1-3 Wilds with x1-x5.
Symbols & Pays
- Wild
- Wild Symbol may land on reels 2-5. Wilds substitute for all paying symbols.
- Scatter Reels
- Treasure Map Scatter and Free Spins Scatter may land on all reels
- Ways Pays
- Top symbol 5x · Lowest 0.1x
Sunken City Riches Demo by Stakelogic
Five bronze gear plaques hang over the Sunken City Riches reels, and in a fresh demo not one of them is lit. The four on the left name reel features. Treasure Map scatters open them one at a time, Payway Maker at 4 maps, Upgrade at 8, Wild Multipliers at 12, and Split Symbols at 16. Once a plaque is open, its feature can fire at random on any later spin, so every fourth map, up to the sixteenth, gives this slot another feature. The fifth plaque reads Bonus.
Free Play Features
Treasure Map Meter
A Treasure Map scatter is a rolled parchment map marked with a red dotted path and a red X, with a coloured gem badge showing its value. It may land on any reel, and each one counts twice, once in the Treasure Map Meter and once in the Gem Meter. The Treasure Map Meter opens a new feature for every 4 maps collected, in this sequence.
| Maps | Feature | What it does |
|---|---|---|
| 4 | Payway Maker | Picks a random symbol on reel 1 and copies it onto the other reels to form a payway |
| 8 | Symbols Upgrade | Upgrades a random paying symbol to the highest paying symbol |
| 12 | Add Wild Multipliers | Adds 1 to 3 Wilds at random, each with a multiplier of x1, x2, x3, x4, or x5 |
| 16 | Split Symbols | Splits 1 to 10 random symbols of different types |
Several features can trigger during a single spin, and when they do, they always play in the order of the table, top to bottom. Each one pays any win it makes and then ends. Once all four are unlocked and the Mystery Pick Bonus has been played, the meter starts again from zero with every feature still unlocked. Changing the bet resets the Treasure Map Meter in full.
The game’s story is a quest for the scattered pieces of an ancient map, making it an adventure slot before it is an underwater one. Overgrown jungle ruins, gold gears, and two waterfalls frame the grid, and the sunken city stays a destination.
Gem Meter and Mystery Pick
Every map lands with a multiplier on its gem, and the colour gives the band: green 3x to 10x, blue 15x to 25x, red 50x to 250x, and purple 500x to 1000x. Those values don’t pay when they land. They go into the Gem Meter, the double stack of gear sockets along the grid’s right-hand edge, and the game pays them only in the Mystery Pick Bonus.
When 20 gems have been collected, the Mystery Pick Bonus starts, and the gems transfer into it, where the player chooses gears to reveal multipliers. The round opens with 3 picks. Some gears reveal an extra pick, up to 4 extra for 7 in all, and the bonus ends when no picks remain. It pays the total multiplier times the bet, and after it the Gem Meter can fill again. Gem progress is saved for each bet level separately, so a count built at one stake waits there while another is played.
Free Spins Scatters
Free spins belong to a different symbol, a teal-blue domed building with an arched golden door and BONUS in gold letters, and it may land on any reel. Three of them award 8 free spins, four award 10, and five award 12. When more than three land, the game gives only the highest applicable number of spins. During the round, three more of them add 3 extra spins, four add 4, and five add 5.
How to Play
Monkey Wild and 1024 Ways
The monkey Wild may land on reels 2 to 5 and substitutes for all paying symbols. Wins use 1024 ways across 5 reels and 4 rows, with matching symbols on three or more adjacent reels counted from the leftmost reel. The game pays each symbol for its longest match only and adds together wins on different ways.
Slot RTP
Free spins take 100x the bet as their buy price and start straight away. Super Stake adds half the bet again while it’s active and puts more scatter symbols on the reels, so the free spins round becomes more likely. The symbol pays don’t change. Standard play, Super Stake, and the buy all return the same 96.01% RTP. The default bet is 0.20, and because the Gem Meter saves progress for each bet level, a change of stake brings up the gems saved at that level.
Slot Paytable
Five diving helmets pay 5x, the highest row here, and no card rank reaches 1x even for five. A, K, and Q share one set of values, while J and 10 share another. Every figure is a per-way win, written as a multiple of the stake.
| Symbol | 3 | 4 | 5 |
|---|---|---|---|
| Diving helmet | 1x | 2x | 5x |
| Clam with pearl | 0.6x | 1.2x | 2.5x |
| Compass | 0.5x | 0.9x | 1.5x |
| Trident | 0.4x | 0.7x | 1x |
| A | 0.2x | 0.3x | 0.5x |
| K | 0.2x | 0.3x | 0.5x |
| Q | 0.2x | 0.3x | 0.5x |
| J | 0.1x | 0.2x | 0.4x |
| 10 | 0.1x | 0.2x | 0.4x |
Neither scatter has a row in the table, and the Wild has none either.
Ultimate Slots Verdict
Anyone happy to hold one bet and watch two counts climb will find Sunken City Riches well made, with reel features opening at 4 to 16 maps and a pick bonus at 20 gems. A stake change wipes the map count.
Hits What we like
- Payway Maker, opened at 4 maps, copies a random reel 1 symbol across the reels
- Symbols Upgrade, from 8 maps, turns a random paying symbol into the top payer
- Add Wild Multipliers places 1 to 3 random Wilds, x1 to x5, from 12 maps
- Split Symbols, opened at 16 maps, splits 1 to 10 random symbols
- Mystery Pick Bonus starts at 20 gems with 3 picks and can reach 7
- Free Spins retrigger, adding 3 to 5 more spins for 3 to 5 scatters
Misses What could be better
- Changing the bet fully resets the Treasure Map Meter and its map count
- Five diving helmets top the pay table at 5x, and map values pay only in the Mystery Pick
Detailed Review
Final Thoughts
15,000x the bet caps a win in Sunken City Riches, in the base game and in free spins alike, while five diving helmets, the top row of the pay table, return 5x. Read against that 5x, the meters are the game. Map values of up to 1000x pay only in the Mystery Pick, the Add Wild Multipliers feature needs 12 maps before it can fire, and Symbols Upgrade needs 8.
Stakelogic dresses its September 2026 release as a hunt, with a map marked by a red X on every Treasure Map scatter and a story about a sunken city full of treasure. Underneath, it plays like a progress bar, and the plaques and the gem column keep both of its counts on screen. Each map is banked twice, and the game spends those balances on its own terms, the gear features at random on later spins and the gem values in one pick round.
A close comparison on the site is the Vault Meter in Piggy Heist, where every 6 Stethoscope Scatters unlock one new Wild stage and progress is tied to the bet. Sunken City Riches splits that idea in two. One count opens four different reel features, the other stores multiplier values for a pick, and a single symbol feeds both.
The two counts part company when the bet moves, and that is the cost here. The Gem Meter keeps a separate saved total at each bet level, but the Treasure Map Meter resets in full on any change, so a player who adjusts the stake partway up starts the map count again from zero. Nor do the maps pay anything on the reels; their value waits for 20 gems. Two half-filled meters make a strong case for one more spin, and that pull deserves to be seen for what it is.
Does the hunt reward patience, then? At one fixed bet, yes. The four features open in a set order, stay unlocked once a full cycle and the pick are done, and give the reels something new at 4, 8, 12, and 16 maps, which is more structure than a 5x helmet suggests. The pick bonus makes the same case from the other side. Its 3 to 7 picks pay the total multiplier times the bet, and the gems behind it are saved for each bet level, so patience counts there too.
