Players report that Cool Jewels by NYX/OpenBet offers an engaging gaming experience characterized by its vibrant graphics and appealing jewel-themed symbols. The game features a unique cascading reels mechanic, where winning combinations disappear, allowing new symbols to fall into place, which can lead to consecutive wins. This mechanic adds a layer of excitement, keeping players on their toes. The community finds the game fairly easy to understand, making it accessible for both novice and seasoned players. Features such as bonus rounds and multipliers add to the win potential, though players note that the maximum payouts can feel somewhat modest compared to other slot games on the market. Overall, Cool Jewels is viewed as a solid choice for those who enjoy visually appealing slots with fun features, though it may not cater to high-risk players seeking big wins.