The engine that drives this sugar rush slot game is the tumble, sometimes called the avalanche or cascade. After every spin, winning clusters pay and disappear, the surviving candies fall to fill the gaps, and fresh symbols drop from above. Tumbling repeats until a drop produces no new win, and only then does the total land in your balance.
Underneath that sits the multiplier underlay, the part worth understanding properly. A square block from 2×2 up to a full 7×7 can appear at random beneath the candies, carrying a 2× boost. Win on top of it and after the next tumble the multiplier doubles, climbing through 4×, 8×, 16× and onward to a hard cap of 128× before it clears at the end of the sequence. Long cascade chains are where the slot earns its big totals.
The Candy Rush scatter and bonus trigger
The bonus symbol acts as the slot's scatter. Land 3, 4, 5, 6 or 7 of them anywhere and you trigger Free Spins or Super Free Spins at random, banking 10, 12, 15, 20 or 30 spins. In the standard round a random-size underlay is guaranteed every spin; in the Super round, that underlay is always a full 7×7. Hit the bonus symbols again during the feature to retrigger and add the same spin counts on top.
Playing this game at casino sites
At any casino site carrying it, you can also shortcut the wait with the buy feature, paying upfront to jump straight into the round. The exact prices are broken down on the buy feature tiers and costs page, and I would test the mode in demo before paying for it. The whole thing also runs natively on phones, so you can play Candy Rush on mobile with the same cascade speed as on desktop, or just warm up with the candy rush free demo first.