Developer Supreme Diamond XXL by 3 Oaks Gaming is a 3x5, 15-line slot game with a May 2026 release date. The design combines classic-inspired reels with a Hold & Win format, where the black Collect Symbol plays a central role. Players can use the demo version to play for free and practice before playing for real money.
During the Hold & Win bonus game, up to five Collect Symbols can land on reel two and stay locked in place. While fixed on the reels, they absorb the values of visible Bonus Symbols, which may include MINI, MINOR, MAJOR or GRAND jackpots. Once collected, those Bonus Symbols are removed and replaced by new ones, keeping the round active.
The bonus game can be triggered by landing a combination of Bonus and Collect Symbols, by activating the Lucky Spin feature, or through the Diamond Metre. A Bonus Shop is also included, allowing access to the bonus game and Super Bonus Game, where the round begins with at least three Collect Symbols.
