All41 Studios, a partner of Microgaming, has explored various themes in the past, but their latest game Kings of Crystals marks their first foray into the medieval fantasy slot genre. The game follows three kings on a quest to find their crystal crowns of different colors, which are collected as scatter symbols throughout gameplay. These scatter symbols eventually trigger bonus rounds, each with its own unique features. While the visuals of the game may seem outdated and the character designs inconsistent, players can still enjoy the bonus rounds that break up the base game. The game offers various features such as wild symbols, different colored crystal crown scatters, and multiple bonus rounds with different modifiers. Players can purchase bonus rounds directly from the in-game menu, with prices ranging from 20 to 110 times the stake. The game also provides the opportunity to combine multiple bonus rounds for potentially larger payouts. However, the high cost of purchasing bonus rounds and the difficulty of landing jackpots may deter some players. Overall, Kings of Crystals offers an interesting gameplay experience with the potential for big wins, but players should be cautious of the high cost and low probability of hitting the maximum jackpot.