Million Christmas presents a 6x10 grid where winning combinations trigger cascading reels. Symbols disappear after payouts, allowing new icons to drop into the empty spaces for potential consecutive wins. Grey blocker symbols appear on the reels to prevent standard paylines, but collecting these can activate the special minigame. The base game focuses on building these cascades to reach the bonus meter.

Landing 5 or more consecutive cascades triggers the free spins feature, which includes an additional reel for multipliers and extra spins. The separate minigame offers a 5x3 reel set with special symbols that can increase win values or add rows.