3 Oaks

Rio Gems

Slots Video Slots Gems Festival Carnival

Carnival gem slot pairing Hold and Win with a Super Bonus

Random Bonus Symbols appears on 89 of the 26,194 games in our catalog, Rio Gems among them.

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.

How this score is built

RTP

95.69%

return to player

Volatility

High volatility

variance

Max win

10,000×

top multiplier

Min bet

$0.25

per spin

Reels

25 lines

Player rating

3.9 ★

6 votes

DEMO Play free, no signup

3 Oaks

Embed on your site

3.9 / 5

6 ratings

User ratings are shown separately from the Slot Score unless stated otherwise.

Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.

Payouts & RTP8/10

RTP 95.69% → 8.0/10

Volatility9/10

high → 9.0/10

Win Potential8/10

x10000.00 (10000×) → 8.0/10

Features10/10

16 features → 10.0/10

Game Mechanics7.2/10

f=16 r=5 p=25 → 7.2/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility4/10

0.25–20 (×80) → 4.0/10

Provider Reputation6.3/10

provider avg 6.3 → 6.3/10

Popularity2.5/10

synthetic proxy → 2.5/10

Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.

Cite this score

SlotRanker Score: 71 — Rio Gems by 3 Oaks

https://slotranker.com/3-oaks/rio-gems#score

How to cite

Slot Summary

December 2022 placed Rio Gems in 3 Oaks' carnival setting, but the game's identity comes from how its gem symbols feed a Hold and Win branch. Six qualifying symbols begin the respin round, while a separate Super Bonus can raise the values entering that mode. A 95.69% RTP, high volatility, and x10000.00 ceiling make the bonus system the clear center of the design.

How It Plays

Rio Gems uses a 5x3 layout with 25 paylines. Ordinary spins can lead toward either Free Spins or the respin-based Hold and Win round.

During Hold and Win, newly landed Bonus symbols occupy positions and reset the respin opportunity. Mystery symbols can reveal jackpot results or a Super Bonus symbol.

Theme & Atmosphere

Carnival and Festival imagery gives the gem collection a Rio celebration context, linking dancers, feathers, drums, and gemstones to the game's main reward events.

The Gems theme remains functional throughout the feature set because differently colored stones determine ordinary Hold and Win and Super Bonus entry conditions.

Gems Festival Carnival

Features & Win Potential

Hold and Win starts with 3 respins after 6 qualifying Bonus symbols land. Mystery symbols introduce uncertainty by revealing a jackpot or Super Bonus result.

Remove Symbols and top-paying-symbol selection reshape the symbol pool during Free Spins, separating that feature from the locked-position behavior of the respin round.

High volatility Free Spins Scatter Symbol Wild Symbol Respins 5 Reels Bonus Game Symbols collection (Energy)Additional Free Spins Bonus symbols Hold and Win Mystery symbol 25 Paylines Remove Symbols Additive symbol Random bonus symbols

Bonus & Free Spins

Free Spins remove lower-paying symbols from consideration, while the separate Hold and Win Bonus Game locks qualifying gems and refreshes its respins when more arrive.

The Super Bonus starts from 5 blue or green Bonus symbols plus a white Super symbol, or when a Super symbol appears during Hold and Win.

Spec sheet

Rio Gems at a glance.

Identity

Slot nameRio Gems

Studio3 Oaks

Released12/2/2022

Math

SlotRanker Score71

RTP95.69%

VolatilityHigh volatility

Max win10,000×

Bet range$0.25 – $20.00

Player rating3.9 / 5 · 6 votes

Format

Reels5

Paylines25

Layout5x3

Features

Themes

Expected average based on this slot's 95.69% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$4.31

Cost per session$4.31

Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.

How long could a bankroll last on Rio Gems? We simulate thousands of sessions from this game's published RTP and volatility — the long-run math, not a prediction of your next spin.

Bankroll ($)Bet per spin ($)Speed

Volatility tier: High

Running simulation…

How this works

Each simulated spin either misses or returns a win drawn from a log-normal distribution, with the hit rate and spread set by the slot's volatility tier (High). The model is calibrated so the average return equals this slot's published RTP (95.69%), with wins capped at its top multiplier (10,000×).

This is a simplified, parametric model of the game's math — not its real paytable. It exists to make the house edge visible over many sessions, so the numbers above are averages across thousands of runs, never a forecast of one.

This is math, not a prediction. Real sessions vary wildly, and no strategy changes a game's built-in house edge. Play for fun, set limits, and never bet more than you can afford to lose.

Where to play Rio Gems

No matching casinos for your region yet

Casino availability depends on where you play from. We only show casinos that accept players from your country.

Compare Rio Gems with other games

	Rio Gems Score 71This game	Countdown to Fortune Score 75	Alohawaii: Cash Collect Score 65	Carnaval Drums Score 65	9 Masks of Voodoo Score 56
Identity
Studio	3 Oaks	Naga Games	Rarestone Gaming	Gameburger Studios	Spinmatic
Released	12/2/2022	12/25/2024	7/5/2023	2/3/2025	10/16/2024
Math
RTP	95.69%	96.46%	95.87%	96%	94.72%
Volatility	High volatility	Medium volatility	Medium volatility	High volatility	—
Max win	10,000×	—	—	3,125×	—
Format
Reels	5	5	5	5	5
Layout	5x3	5x3	5x3	5x3	5x3
Paylines	25	5	30	20	20
Min bet	0.25	—	0.1	0.2	0.2
Max bet	20	—	500	80	80
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	✓	✓	✓	✓	✓
Scatter symbol	✓	✓	✓	✓	✓
Multiplier	—	✓	—	—	✓
Bonus game	✓	✓	✓	—	✓
Respins	✓	✓	—	—	—

Every number is shown as a delta against Rio Gems.

Comparing against

Rio Gems

3 Oaks

RTP

95.69%

Max win

10,000×

Score

Alohawaii: Cash Collect

− Bonus Game− Respins

+ Multiplier− Respins

Explore More Games with Similar RTP

	Provider	RTP	Volatility	Max win	Score
Wild Streets	Playcognito	95.65%	High volatility	26,000×	77
Emerald King: Rainbow Road	Reel Kingdom	95.66%	High volatility	20,000×	77
Big Gains	Red Tiger Gaming	95.67%	Medium/High	39,375×	80
Sugar Monster	Red Tiger Gaming	95.68%	High volatility	10,806×	83
Rio Gems	3 Oaks	95.69%	High volatility	10,000×	71
Buffalo Mania Megaways	Red Tiger Gaming	95.69%	High volatility	19,995×	76
Madame Destiny Megaways	Pragmatic Play	95.7%	High volatility	5,000×	80
Piggy Riches 2 Megaways	Red Tiger Gaming	95.71%	High volatility	20,000×	76
Wrigley’s World	Red Tiger Gaming	95.72%	High volatility	20,023×	80
Candy Wild Bonanza	StakeLogic	95.73%	High volatility	20,000×	80
Year-Round Riches Clusterbuster	Red Tiger Gaming	95.74%	—	20,482×	80