A cluster payout mechanism is used in the 8 row, 8 column slot machine game known as Santa's Stack. Created by Relax Gaming and centred on Christmas with flashing lights, elves, red-nosed reindeers and more filling the reels, it comes with a classic retro vibe and a handful of attractive additional features. There is a chance for maximum wins of 20,000 times with the free spins, respins, and multipliers available.