Cascading reels explained
Cascading reels is a slot mechanic where winning symbols disappear after a win and new symbols fall into the gaps, giving another chance to win on the same stake. The chain continues until a drop produces no new win. Studios call it tumbles, avalanches or reactions, but the process is the same.
By the Best Slots UK team. Last checked .
Key takeaways
- One stake covers the whole chain of cascades, however long it runs.
- Many games add a multiplier that climbs with each cascade in a chain.
- Cascades are already counted in the published RTP; they add no extra value.
- Different studios use different names: avalanche, tumble, reaction, rolling reels.
- Also called
- Tumbling, avalanche, rolling reels, reactions
- Cost
- No extra stake per cascade
- Ends when
- A refill creates no new win
- Common partner
- Rising multipliers
- Found on
- Paylines, ways, cluster and pay anywhere slots
What cascading reels are
On a traditional slot, each spin is a single event: the reels stop, any wins are paid and the next spin starts from scratch. Cascading reels turn one spin into a possible sequence. When a win lands, the symbols that formed it are removed, the symbols above slide down, and fresh symbols fill the empty spaces from the top. If the new arrangement forms another win, the process repeats.
The mechanic works with almost any win system. It sits on top of fixed lines in Gonzo’s Quest, on top of Megaways in many Big Time Gaming titles, and on top of cluster pays and pay anywhere grids in games such as Sweet Bonanza.
What happens during one cascading spin
- You place one stake, for example 50p, and the reels stop.
- The game checks for wins. If there are none, the spin ends.
- Winning symbols are paid and removed from the grid.
- Remaining symbols drop down and new symbols fall in to fill the gaps.
- The game checks again; steps 3 and 4 repeat while new wins keep forming.
- When a refill brings no win, the sequence ends and the total is added to your balance.
Everything above counts as a single game round. You are not charged for each refill, and UK rules on spin speed apply to the round as a whole: a minimum of 2.5 seconds per spin, with no turbo or slam-stop to skip the animation.
Cascading reels by another name
Developers trademark or brand their own versions, which is why the same idea appears under several labels in game rules.
| Name in the rules | Studio associated with it | Well-known example |
|---|---|---|
| Avalanche | NetEnt | Gonzo’s Quest |
| Tumble | Pragmatic Play | Sweet Bonanza |
| Reactions | Big Time Gaming | Bonanza Megaways |
| Cascades or cascading wins | Various studios | Reactoonz (Play’n GO) |
The detailed walkthrough in how cascading reels work covers some of the more unusual variants, such as symbols that fall sideways or explode.
Cascading reels and the multiplier ladder
A cascade on its own simply gives the grid another look. What turns a chain into a significant result is usually a multiplier that rises with each consecutive cascade. Gonzo’s Quest is the textbook case: in the base game its Avalanche multiplier climbs 1x, 2x, 3x, then 5x, and in the Free Fall round the ladder steps up to 3x, 6x, 9x and 15x.
| Cascade | Line win before multiplier | Multiplier | Paid |
|---|---|---|---|
| First win | £0.40 | 1x | £0.40 |
| Second win | £0.60 | 2x | £1.20 |
| Third win | £0.20 | 3x | £0.60 |
| No further win | – | – | Total £2.20 |
Without the ladder, the same three wins would have paid £1.20. With it, the chain pays £2.20, a little over twice the stake. The ladder resets as soon as a cascade fails to produce a win, so long chains are what matter, and they are uncommon. In Bonanza Megaways, the free spins round carries a multiplier that rises by one with every reaction and does not reset between spins, which is where that game’s largest results come from.
Do cascading reels improve your chances?
No. Cascades feel generous because one spin can produce several wins, but every possible chain is already built into the game’s maths and its published RTP. A slot with cascades and a 96% RTP returns the same theoretical £96 per £100 staked as a slot without them at 96%. The mechanic changes how returns are distributed, not how large they are on average.
In practice, cascades often spread small wins across more spins, raising hit frequency, while the multiplier ladder concentrates the bigger payouts into rare, long chains. That combination is why many cascading slots are rated high volatility.
| Slot | Developer | RTP | Volatility | Max win |
|---|---|---|---|---|
| Gonzo’s Quest | NetEnt | 95.97% | Medium | 2,500x |
| Bonanza Megaways | Big Time Gaming | 96.00% | High | Varies by version |
| Reactoonz | Play’n GO | 96.51% | High | 4,570x |
| TNT Tumble | Relax Gaming | 96.11% | Medium–high | See game rules |
| Temple Tumble Megaways | Relax Gaming | 96.25% | High | About 7,767x |
| Esqueleto Explosivo | Thunderkick | 96.0% | Low | 700× |
Cascading reels myths and facts
- Myth: a long chain means the slot is “hot”. Fact: each spin is independent, decided by the RNG when the round starts.
- Myth: the refill symbols are random each time. Fact: in most games the full outcome, including every refill, is determined when you press spin; the drops are how it is revealed.
- Myth: cascades cost extra. Fact: the stake is taken once per round, however many refills follow.
- Myth: more cascades means a better RTP. Fact: the RTP already includes every possible chain.
Browse more games built around this mechanic on our cascading reels slots page.
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Frequently asked questions
What are cascading reels in slots?
Cascading reels are a mechanic where winning symbols vanish after a payout and new symbols drop into the empty spaces, allowing further wins from the same stake. The chain keeps going until a refill produces nothing new, and the whole sequence counts as one paid spin. The feature appears under names such as avalanche, tumble and reactions, depending on the studio. Many cascading slots also add a multiplier that rises with each step in the chain. For more on how spins are put together, see how slots work.
What is the difference between cascading reels and tumbling reels?
There is no real difference: tumbling reels is simply Pragmatic Play’s name for cascading reels. Other studios use avalanche (NetEnt), reactions (Big Time Gaming) or rolling reels, and the basic process is identical. Winning symbols are removed, the remaining ones fall, and new symbols fill the space. Where games do differ is in the extras attached, such as multipliers that grow with each tumble, symbols that explode instead of falling, or grids that expand after each win. Our Sweet Bonanza review shows the tumble version in action.
Do cascading reels cost extra?
No, cascading reels never cost anything beyond your original stake. If you bet 40p and the spin produces a chain of five cascades, all five wins are paid from that single 40p bet. Your balance changes once, at the end of the round, by the total won minus the stake. UK rules require the net position for your session to be shown clearly, so you can always see whether you are up or down after a chain. The net position display entry explains how that figure works.
Do cascading reels increase a slot’s RTP?
No, cascading reels do not add anything to a slot’s RTP, because every possible chain is already part of the game’s maths. Developers design the reel strips, paytable and multiplier ladder together so that the total of all outcomes, cascades included, matches the published return. A cascading slot at 96% and a non-cascading slot at 96% have the same long-run cost of £4 per £100 staked. The difference is in volatility and how often you see small wins. Read more in our RTP glossary entry.
Which was the first slot with cascading reels?
The slot most often credited with bringing cascading reels to a mass online audience is NetEnt’s Gonzo’s Quest, which used its Avalanche feature with a rising multiplier in both the base game and the Free Fall round. Whether it was the very first is debated, and we have not found a definitive record, so treat claims of a single inventor with caution. What is clear is that the mechanic spread widely after Gonzo’s Quest and is now standard. Our history of online slots in the UK covers this period.
Is a long cascade chain a sign the slot is about to pay?
No, a long cascade chain tells you nothing about what comes next. Each game round is decided independently by the random number generator, so a slot that has just produced a long chain is no more or less likely to do so on the next spin. Believing otherwise is a version of the gambler’s fallacy, which can lead to chasing losses. If you notice yourself playing on because a game feels close to paying, it may be time for a break. Our page on why slots are never due a win explains the maths.
Can cascading reels happen in the free spins round?
Yes, and in many slots the cascades become more valuable during free spins. Gonzo’s Quest raises its multiplier ladder during Free Falls, and Bonanza Megaways uses an unlimited multiplier that grows by one with each reaction and carries over between spins in the round. Other games keep the cascade mechanic unchanged but add sticky multipliers or extra symbols. The rules screen will say whether the multiplier resets after each free spin or persists. Our free spins feature entry covers how these rounds are triggered.