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InOut Games • Underground Digging Slot
Topo Mole — Tunnel Wilds & Dig Bonus
Moles dig through soil across a 5×3 grid with twenty paylines. Tunnel Wilds carve paths through the grid, leaving Wilds in their wake for chained line wins. Mole Multipliers escalate values per multiplier collected during the round. Underground Free Spins triggers on scatter combos. The Dig Bonus opens treasure pick rounds for instant prizes.
96%RTP
3,000xMax Win
InOut GamesProvider
Tunnel Wilds, Mole Multipliers & Dig Bonus
Topo Mole sits inside the InOut Games arcade-slot lineup, where every release leans on a single mechanical hook. Here that hook is the mole itself — a wild that doesn't just sit on a reel, it digs. The 5×3 grid carries 20 fixed paylines on the surface, and the math runs at 96% RTP with a 3,000x top payout. Bets start at $0.10 and stretch to $50, which keeps the volatility band wide enough for casual sessions and serious chasers alike.
Tunnel Wilds are the mechanic that earns the game its name. When a mole symbol lands, it carves a path across the row or column, leaving Wild markers on every position it passes through. Multiple tunnels in the same spin can chain into intersecting Wild grids — that's where 20-line games suddenly start paying like 50-line games. Every Mole Multiplier picked up during the round stacks against your win total before payout, so the longer the tunnel runs, the bigger the multiplier ladder gets.
The two bonus paths are Dig Bonus and Underground Free Spins. The Dig Bonus opens a pick-and-reveal screen — you choose treasure tiles for instant credits until the round ends. Underground Free Spins triggers on three or more scatter combos and unlocks a free-spin layer where Tunnel Wilds spawn at a higher rate and Mole Multipliers carry over between spins. That carryover is what fuels most realistic 1,000x+ runs, and at maximum depth it's the only realistic route to the 3,000x cap.
96%
InOut Games digging standard.
3,000x
At maximum dig depth.
Medium
Surface calm, deep payoffs.
4+
Tunnel Wilds and depth layers.
Topo Mole Free Demo
No Registration Required
Big Win Potential
Experience Topo Mole! Try the game mechanics and features risk-free with our free demo mode.
96%
RTP
3,000x
Max Win
Medium
Volatility
$0.10
Min Bet
$50
Max Bet
Why Play Topo Mole Demo?
Risk-Free Spins
Experience the full potential of Topo Mole 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
No sign-up, no emails, no downloads. Access the full gameplay instantly from any browser.
Mobile Optimized
Try the demo on your mobile device to experience all the animations and special effects on the go.
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Bonus Mechanics Explained
4 mechanics drive the 3,000x max win. Here's exactly how each one works.
Dig Bonus
How to Trigger
Land 3 shovel symbols on the reels in the same spin to open the Dig Bonus pick screen.
What Happens
A grid of underground tiles appears. You pick tiles one at a time to reveal cash prizes, multiplier boosts, or extra picks. Each layer drills deeper with bigger values on offer. The round ends when you flip a rock tile — that's the closer, and your collected total pays out as a single win against your stake.
Multipliers
Tile values run from 5x your bet at the surface up to 250x on the deepest layer. Hidden multiplier tiles (x2 / x3) double or triple everything collected so far.
Odds
Natural trigger rate sits around 1 in 180 spins. Average payout lands near 50x the stake. Top 5% of rounds clear 200x.
Strategy
Aim for corner tiles — the math model weights deeper-layer entry points toward the edges of the grid. Multiplier tiles tend to reveal mid-round rather than at the start, so resist cashing out early if the option appears.
| Trigger | 3 shovel symbols |
| Tile Range | 5x to 250x stake |
| Multipliers | x2 / x3 hidden tiles |
| Trigger Rate | ~1 in 180 spins |
| Average Return | ~50x stake |
Tunnel Wilds
How to Trigger
A mole wild lands on any reel during base or bonus play. The mole then digs across the grid before symbols lock.
What Happens
When the mole lands, it carves a path across one row or column, dropping Wild markers on every position it passes through. Multiple tunnels in the same spin can intersect, blanketing large sections of the 5×3 grid with Wilds. Connected paylines through the tunnel pay normally — the difference is how many lines a single mole creates at once.
Multipliers
No direct multiplier on the wild itself. Value comes from the line count: a single horizontal tunnel completes up to 5 paylines simultaneously. Two intersecting tunnels can cover 10+ winning lines.
Odds
Single tunnel wild lands roughly 1 in 12 spins. Two tunnels in the same spin: about 1 in 80. Three or more tunnels (rare grid blanket): under 1 in 400.
Variants
In the base game tunnels run in one direction. During Underground Free Spins they can curve, branching across rows and columns from a single mole landing.
Strategy
Tunnel Wilds are the spine of the math model — most of the RTP flows through them. Bet sizing matters more than chasing patterns; the wild rate is fixed regardless of stake. Sessions with at least 200 spins give the multi-tunnel events room to fire.
| Single Tunnel | ~1 in 12 spins |
| Double Tunnel | ~1 in 80 spins |
| Direction | Row or column (base) |
| Bonus Variant | Curves and branches |
| Lines Affected | Up to 5 per tunnel |
Underground Free Spins
How to Trigger
Land 3 or more scatter symbols anywhere on the reels in a single spin to award 12 Underground Free Spins.
What Happens
Free spins play out across an underground reel set. Each spin pushes the mole one layer deeper, and depth is what powers the round — symbol values rise step by step, Tunnel Wilds spawn at higher rates, and a running depth meter tracks Mole Multipliers between spins. Two more scatters during the feature retrigger another 6 spins and reset the depth ramp upward rather than resetting it to zero.
Multipliers
Symbol values scale with depth: layer 1 pays at base rates, layer 12 pays at roughly 4x the base rates. The depth meter feeds directly into the Mole Multiplier stack.
Odds
Natural trigger rate is around 1 in 220 spins. Retrigger probability inside the feature: ~14%. Average free-spin payout: ~85x the stake. Top 1% of rounds clear 1,000x.
Variants
A 4-scatter trigger awards 18 spins instead of 12. A 5-scatter trigger awards 24 spins and starts the depth meter at layer 3 already filled.
Strategy
Free Spins is the realistic path to the 3,000x cap. The depth-driven scaling means short rounds rarely go big — every retrigger compounds the math, so feature length matters more than bet size. If the game offers a feature buy, the price tracks expected return closely, so it's a flat decision rather than +EV.
| Spins Awarded | 12 (base trigger) |
| Trigger Rate | ~1 in 220 spins |
| Retrigger Odds | ~14% |
| Depth Layers | 12 (with retriggers higher) |
| Average Return | ~85x stake |
Mole Multipliers
How to Trigger
Active during Underground Free Spins. Each spin advances the depth counter by 1, which in turn raises the running multiplier.
What Happens
The depth counter and the multiplier counter move together. By spin 12 of a 12-spin round, the multiplier sits at 12x. Retriggers don't reset the counter — they extend it. That's how a long bonus round can finish at 18x or 24x. Every win that lands during the feature is multiplied by the current depth value before being added to the round total, so late-round Tunnel Wilds carry the heaviest payouts.
Multipliers
Multiplier ramps from 1x on the opening spin to 12x on a base-length round. Retriggered rounds can push the multiplier past 20x. The multiplier resets to 1x only after the bonus closes.
Odds
Inside Free Spins the multiplier is deterministic — every spin adds exactly 1x. The variance comes from when wins land relative to the multiplier value, not from the multiplier itself.
Strategy
Late-round wins are worth dramatically more than early ones. Cosmetically the slot encourages you to celebrate every spin equally, but the math says spins 8-12 carry most of the round value. Riding out a slow start is correct — the feature is back-loaded by design.
| Per-Spin Increment | +1x |
| Base Round Peak | 12x |
| Retrigger Peak | 20x+ |
| Reset Trigger | Bonus end only |
| Active In | Underground Free Spins |
Topo Mole FAQ
Frequently asked questions about the game
Topo Mole has an RTP of 96%, matching the industry standard. InOut Games certifies this figure through independent testing for the standard configuration.
Land 3 shovel symbols to enter. Pick tiles from underground layers — each layer goes deeper with better prizes. Hit a rock and the round stops. Strategy tip: corner tiles tend to hide the entry to deeper layers.
The max payout is 3,000x your stake. The most likely route there is through Underground Free Spins with a high depth multiplier combined with Tunnel Wilds creating large winning combinations.
Wild mole symbols extend through adjacent positions horizontally or vertically, creating tunnel-shaped wild patterns. In the base game you get single tunnels. During free spins, tunnels can appear on multiple reels simultaneously.
Yes. InOut Games builds all titles in HTML5 for full cross-platform compatibility. Topo Mole runs on any modern mobile browser on iOS and Android.