Developer Santa's Stack is a Christmas-themed video slot from Relax Gaming built on an 8×8 grid with cluster pay mechanics. Wins are formed by five or more matching symbols touching anywhere on the board, while wild symbols can substitute for other icons to complete clusters. The game is set at high volatility, with an RTP range listed at 96.27% to 97.00%.
When a winning cluster lands, the respin feature is triggered, creating the chance to add more wins within the same sequence. The Secret Santa feature starts from the first spin and expands after each turn, increasing the number of reward opportunities. Players can use the demo version to play for free and practice before playing for real money.
Three or more Christmas Tree symbols activate the free spins round, which begins with five spins and can extend to eight if more trees land during the bonus. A feature buy option is also available for the Christmas Day feature, allowing direct access to the bonus game without waiting for a random trigger.
