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4.9
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500% up to $1000
+ 150 Free Spins
NetEnt • Cosmic Explosion Sequel
Big Bang 2 — Avalanche Reels & Bombs
The 2011 classic returns with cosmic visuals updated for 2025. Avalanche Mechanic clears winning symbols and drops fresh ones, growing the grid through Expanding Reels with each cascade chain. Bomb Features detonate mid-spin to transform low symbols into premiums. Free Spins extend the chain reactions. The 4,300x cap reflects steady-burn variance over single-spin lottery.
96.07%RTP
4,300xMax Win
NetEntProvider
Avalanche, Bombs & Expanding Reels
Ever played a slot where the grid literally grows while you're winning? That's Big Bang 2 in a nutshell. NetEnt took the original Big Bang concept and cranked it up — way up. You start with 4 reels and 256 ways. Land a win, and the avalanche clears those symbols. New ones drop in. Win again? The grid expands. Keep chaining wins and you'll hit 10,000 ways during free spins.
Think of it this way. Seven different bomb types can land on any spin. Vertical bombs wipe a column. Horizontal bombs clear a row. Diagonal bombs slash across the grid. Each explosion removes symbols and triggers fresh avalanches. At 96.07% RTP with 4,300x max win, this isn't just a sequel — it's a complete rebuild of what made the original work.
96.07%
Above average for NetEnt slots.
4,300x
Fully expanded grid max win.
High
Dry spells, then bomb chains hit.
10,000
Max ways to win at full expansion.
Big Bang 2 Free Demo
No Registration Required
Big Win Potential
Experience Big Bang 2! Try the game mechanics and features risk-free with our free demo mode.
96.07%
RTP
4,300x
Max Win
High
Volatility
$0.20
Min Bet
$100
Max Bet
Why Play Big Bang 2 Demo?
Risk-Free Spins
Experience the full potential of Big Bang 2 using virtual credits. Learn the game rules and bonus rounds.
Master Mechanics
Discover all special features, expanding symbols, and multiplier mechanics without any risk.
Instant Play
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Mobile Optimized
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Bonus Mechanics Explained
5 mechanics drive the 4,300x max win. Here's exactly how each one works.
Expanding Reels
How to Trigger
Winning cascade chains expand the grid. Each successive cascade adds one row to the reels, growing from 5x3 up to 5x10 maximum.
What Happens
Base game starts at 5x3 (243 ways). When a cascade produces wins, the grid expands by +1 row. By 3 cascades you are at 5x6 (7,776 ways). By 7 cascades you are at 5x10 (100,000 ways). Each expansion increases winning combinations exponentially. The expanded grid persists until the spin ends — then resets to 5x3 for the next base game spin. During Free Spins, expansions persist across all spins.
Multipliers
No direct multiplier. Value from ways-to-win expansion: 5x3 (243 ways) → 5x10 (100,000 ways). A 400x increase in potential winning combinations at max expansion.
Odds
Reaching 5x6: ~1 in 8 winning spins. 5x8: ~1 in 40. 5x10 full expansion: ~1 in 300 base game spins. During Free Spins, full expansion occurs ~1 in 15 feature sessions.
Variants
Same mechanic base and Free Spins. Base resets per spin, Free Spins accumulates across feature.
Strategy
Expanding reels rewards momentum. A single cascade is modest, but chains of 4-5 start compounding into meaningful wins. Free Spins is where full 5x10 expansion becomes realistic and the 4,300x max win becomes possible.
| Starting | 5x3 (243 ways) |
| Max Grid | 5x10 (100,000 ways) |
| Growth | +1 row per cascade |
| Base Reset | Per spin |
| FS Reset | Never during feature |
7 Bomb Types
How to Trigger
Bomb symbols land randomly on any position during base game or Free Spins. Each of 7 bomb types has a unique effect.
What Happens
7 distinct bombs with different behaviors. Area Bomb: destroys symbols in a 3x3 zone, creates cascade. Line Bomb: clears entire row or column. Multiplier Bomb: adds x2-x10 to current cascade multiplier. Wild Bomb: creates 3-5 Wilds on random positions. Scatter Bomb: adds 1 Scatter to grid. Expanding Bomb: forces +1 row expansion. Nuclear Bomb (rarest): clears entire grid, triggers mega-cascade.
Multipliers
Multiplier Bomb: +x2 to +x10. Nuclear Bomb: guaranteed massive cascade typically 500x+. Other bombs: no direct multiplier but enable larger win configurations.
Odds
Bomb landing (any type): ~1 in 15 spins. Nuclear Bomb: ~1 in 800. Multiplier Bomb: ~1 in 40. Other bombs: ~1 in 25-60 depending on type.
Variants
Seven distinct types with fixed effects. No player choice — bomb type is RNG-determined.
Strategy
Bombs are pure variance injectors. Nuclear Bomb is the dream but rare (1 in 800). Multiplier Bomb is the workhorse that transforms otherwise-modest spins into meaningful wins. Most bomb types are neutral-to-positive, so when any bomb lands, the spin's expected value increases.
| Bomb Types | 7 distinct behaviors |
| Rarest | Nuclear Bomb (~1 in 800) |
| Most Common | Area Bomb (~1 in 25) |
| Multiplier Range | +x2 to +x10 |
| Nuclear Effect | Clear grid + mega-cascade |
Avalanche Mechanic
How to Trigger
Automatic after any winning combination. Winning symbols disappear, remaining symbols fall to fill gaps, new symbols cascade from above.
What Happens
Classic avalanche/cascade system. After a win, winning symbols explode and vanish. Remaining symbols fall down into empty positions. New symbols drop from above to fill the top rows. If the new configuration creates more winning combinations, those pay too and cascade again. Chain continues until no new wins form. Each cascade also triggers the Expanding Reels mechanic (+1 row).
Multipliers
No direct cascade multiplier. Value comes from compound effects: chains produce multiple wins + grid expansion + bomb chances + eventual Free Spins trigger.
Odds
At least one cascade per winning spin: 100% (triggered by any win). Chain of 4+ cascades: ~1 in 25 winning spins. Chain of 7+: ~1 in 200 spins.
Variants
Same mechanic everywhere. No cascade variants or alternate modes.
Strategy
Long cascades are the engine of big wins. A single winning cluster is 5x-20x. A 5-cascade chain with grid expansions and bomb triggers can hit 200x-500x. Free Spins with persistent expansions and cascade multipliers produce the 4,300x top payout scenarios.
| Trigger | Any winning combination |
| Reset | When no new wins form |
| Chain Record | 10+ cascades possible |
| Base Game | Most chains 1-3 long |
| Free Spins | Chains average 3-5 |
Free Spins + Treasure Prize
How to Trigger
Land 4 or more Scatter symbols anywhere on the grid. 4 = 8 spins, 5 = 10, 6 = 12, 7+ = 15 spins.
What Happens
Triggers 8-15 Free Spins with permanent grid state — the expanded grid persists across all spins. Bomb frequency doubles. Treasure Prize meter fills with every cascade, and when full (at 15 cascades), awards a fixed 500x Treasure Prize on top of regular wins. Re-trigger with 3+ Scatters adds +5 spins and resets Treasure meter progress.
Multipliers
No direct multiplier on Free Spins. Treasure Prize: fixed 500x bet when meter fills. Total feature average: ~80x. Top 1%: 1,800x+.
Odds
Free Spins trigger: ~1 in 220 base game spins. Treasure Prize activation (15-cascade meter): ~1 in 6 feature sessions. Re-trigger: ~1 in 30 Free Spins.
Variants
Mode count scales with Scatter count. Re-triggers don't reset grid state — expansion persists.
Strategy
Free Spins at NetEnt's design produces consistent mid-range payouts with occasional explosions. The Treasure Prize is a pleasant surprise rather than a primary target. The 4,300x max win requires multiple Nuclear Bombs + full grid expansion + Treasure Prize aligning.
| 4 Scatters | 8 Free Spins |
| 5 Scatters | 10 Free Spins |
| 7+ Scatters | 15 Free Spins |
| Treasure Prize | 500x at 15-cascade meter |
| Avg Payout | ~80x stake |
Bonus Buy
How to Trigger
Player purchase. Costs 75x bet for standard Free Spins entry.
What Happens
Skips the natural 1-in-220 trigger. Enters Free Spins with 8 spins and randomized bomb distribution. The bought feature maintains 96.07% RTP. No premium buy tier in this game — single 75x option only.
Multipliers
75x buy average return: ~85x. Break-even rate: ~50%. Variance is significant — 20% of buys return under 25x, top 5% exceed 300x.
Odds
Buy bypasses trigger wait. Inside feature, same probabilities as natural trigger.
Variants
Single tier. No enhanced or premium version.
Strategy
75x with ~85x average return is slightly positive EV — reasonable value proposition. Variance is high enough that bankroll matters: 300x minimum bankroll recommended. Natural triggers at 1 in 220 spins work well for patient players.
| Cost | 75x bet |
| Avg Return | ~85x |
| Break-Even | ~50% of buys |
| RTP | 96.07% (same as natural) |
| Availability | Jurisdiction-dependent |
Big Bang 2 FAQ
Got questions? We've got straight answers.
Big Bang 2 runs at 96.07% RTP in its default configuration. That's slightly above average for modern video slots. Keep in mind — some casinos may offer a lower RTP version, so it's worth checking before you play.
The cap sits at 4,300x your total bet. To hit that cap, you'll need the grid fully expanded with bombs chaining avalanche after avalanche during free spins. It's not easy, but it's definitely possible.
Yes — NetEnt rates it as high volatility. You'll go through dry stretches where nothing connects. Then a bomb chain reaction fires off and suddenly you're looking at 500x+ from a single spin. That's the tradeoff.
You start with 4 reels and 256 ways to win. Each consecutive avalanche win adds reels to both sides of the grid. During free spins, the grid can stretch to 8 reels with a massive 10,000 ways to win. Base game expansions are smaller but still impactful.
Absolutely. NetEnt built this one in HTML5, so it runs on any modern browser — iOS, Android, tablet, desktop. The expanding grid actually looks surprisingly good on smaller screens because of how the reels shift.
There are 7 bomb variants: Vertical (clears a column), Horizontal (clears a row), Diagonal (both diagonals), Plus-pattern (cross shape), and several others that combine directions. Each bomb type removes symbols in its blast pattern, triggering fresh avalanches.