Cluster Kingdom by ELK Studios is a 5x5 cluster-pay slot set in a medieval kingdom theme. Wins are formed by matching adjacent symbols rather than on paylines, with a high-volatility structure and an RTP of 94%. The game is shown in demo version mode, allowing players to play for free and review the mechanics before playing for real money.
The feature set includes Sticky Redrops, where additional redrops can be awarded if new matching symbols appear, plus wild and multiplier wild symbols. Special symbols also play a central role: the King can upgrade one payout symbol, the Queen can rearrange symbols near her, and the Princess can place 1 to 4 wilds on the grid. The game also offers three bonus games: Regular Bonus, Mini Bonus and Super Bonus.
Cluster Kingdom uses a 5-reel-by-5-row layout with a maximum win stated at 10,000x bet. Bets range from 0.2 to 100, and X-iter modes provide different entry points into features, including a higher-chance bonus option and a Super Bonus mode with persistent multiplier wilds. The game is designed for practice before playing for real money.