Release Date 
Developer Rio Gems is a 5x3, 25-line slot from 3 Oaks Gaming, released in December 2022. The game uses a high-volatility model and a return to player of 95.69%, with bet sizes ranging from 0.25 to 20. Its visual theme draws on Rio carnival imagery, with feathers, dancers, drums and gem symbols.
The main features are the Hold & Win Bonus and Free Spins. The Hold & Win round starts when six blue or green gem bonus symbols land, awarding three respins. During the feature, bonus symbols can reveal Mini, Minor, Major and Grand jackpots, while a mystery symbol may uncover a jackpot prize or a super bonus symbol. Filling the reels can trigger the Royal Jackpot of up to x10,000 the bet.
A Super Bonus Game can begin when five blue or green bonus symbols appear with a white gem super symbol, increasing the value of bonus symbols during the round. Free spins use only the top-paying symbols. The demo version is available to play for free and can be used to practice before playing for real money.
