How do The Curious Machine Plus rules and symbols work?

How do wins work in The Curious Machine Plus? Matching symbols pay from the left across 30 fixed paylines. At my $0.90 stake, each line carried $0.03. Three Future City symbols paid a verified $0.30, while five Inventors carried a $45.00 paytable award. You should compare every listed prize against the line bet rather than the full spin cost. What does the Vortex do in The Curious Machine Plus? The Vortex acts as the Wild on reels 2 and 4. It rotates nearby symbols randomly and may shift to reel 3 when that movement helps a payout. If two Vortexes appear, reel 4 resolves first, and the game counts wins after all movement finishes. You can still receive no win after its animation. How do Free Spins start in The Curious Machine Plus? Dinosaur scatters must land on reels 1, 3, and 5. Both of my triggers awarded 10 spins with random 1x, 2x, 3x, or 5x multipliers. The rounds returned $45.60 and $17.70 at a $0.90 stake. Travel Through Time awards don’t receive those multipliers. What is the Travel Through Time bonus in The Curious Machine Plus? Three Control Boxes on reels 2, 3, and 4 open a second screen. You press TRAVEL to visit new periods and collect cash awards until the sequence ends. My first round made five stops and paid $31.50 in total, equal to 35x my stake. Another trigger can follow a different route. Which symbol pays the most in The Curious Machine Plus? The Inventor ranks highest. At my tested stake, three paid $1.80, four paid $9.00, and five carried a $45.00 award. The Robot and General ranked next, each offering $18.00 for five matching symbols. Remember that these figures reflect the tested line bet and total stake.

The Curious Machine Plus

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Free PlayReal Money

Betsoft

The Curious Machine Plus

Free spinsBitcoin Slots

RTP95.5%

VolatilityMedium

Max winx1,666

Lines30

ThemeFantasy

Provably Fair
Instant Crypto Payouts
Thousands of Games

Written bySophieUpdated October 16, 2026

Chasing Time Through a Steampunk Machine

Spin The Curious Machine Plus and you’ll follow an inventor, his robot and their hidden time machine across a steampunk world.

This traditional Betsoft slot has medium volatility, 95.5% RTP, and a 1,666x maximum win. Its 5×3 layout uses 30 fixed paylines and natural features for patient fans, without bonus buying. My $1,000 balance finished at $1,046.05 after 100 $0.90 spins, although four features made this an unusually warm run. You can play the free demo or real version on SatoshiHero, but I find the elaborate presentation grand for that modest prize ceiling.

Key takeaways

Best bonus: My first Free Spins round paid $45.60, about 51x my $0.90 stake.
RTP / volatility: The mathematical profile combines 95.5% RTP with medium volatility.
Max win: The payout cap stops at exactly 1,666x the stake.
Risk note: The model ranged from $199.90 down to $142.50 up across 1,000 spins.
Bankroll note: My balance reached $980.95 before the first substantial bonus recovery.

Table of Contents

How The Curious Machine Plus Works
Lines and win calculation
Symbols and pay values
Vortex Wild
Rotation and movement rules
What happened in testing
Theme and First Impressions
Steampunk story and setting
Visuals and interface
Travel Through Time
Trigger and travel sequence
First bonus result
Free Spins
Scatters and spin multipliers
Two tested rounds
Double Up
Coin choice rules
When it is unavailable
How It Played Over 100 Spins
Slow opening forty spins
Features changed the session
The Curious Machine Plus RTP and Volatility
1,000-spin simulator projection
Our 100-spin session
Frequently Asked Questions About The Curious Machine Plus
Closing Thoughts

How The Curious Machine Plus Works

Wins use a 5×3 reel set and 30 fixed paylines, paying matching symbols from left to right. You can’t reduce the line count, so every spin covers all 30 patterns.

Lines and win calculation

Every displayed paytable award uses the line bet, not your full stake. At my $0.90 total stake, each active line carried $0.03. Three Future City symbols returned $0.30, matching the listed award of ten line bets exactly.

Three skyline symbols framed with $0.30 win showing — The $0.30 line win remains framed.

Fast Fact: At the $0.90 default stake, each of the 30 paylines carries a $0.03 line bet.

The controls and settled reels remained clear in my tested desktop view. I could follow the balance, stake, and win amounts without hunting through menus, which matters when several animations play together.

Symbols and pay values

At the tested stake, the seven regular symbols paid these amounts for three, four, or five matches:

Inventor: $1.80, $9.00, and $45.00.
Robot: $0.90, $3.60, and $18.00.
General: $0.90, $3.60, and $18.00.
Control Console: $0.45, $1.80, and $9.00.
Pressure Gauge: $0.45, $1.80, and $9.00.
Future City: $0.30, $0.90, and $4.50.
Blueprint: $0.30, $0.90, and $4.50.

Seven regular symbols with three payout columns — The paytable presents every regular symbol.

Three special symbols control the larger features. The Vortex acts as the Wild, Dinosaur scatters start Free Spins, and Control Boxes open Travel Through Time.

Three special symbols with activation notes displayed — Three special symbols share one panel.

Second Chance can activate after a losing spin sits one symbol short of five matching symbols. It automatically respins one reel for free, though I didn’t clearly catch the effect during testing. Check your line bet before comparing any paytable value with your total stake.

Vortex Wild

The Vortex is a moving Wild that rotates nearby symbols after landing on reel 2 or reel 4. You’ll see its full movement finish before the game counts any completed paylines.

Rotation and movement rules

The symbol spins surrounding positions a random number of times. A lone Vortex may stay in place or slide onto reel 3 when that move helps form a payout. When two appear together, the one on reel 4 resolves first.

None of those movements guarantees a winning line. You might watch the entire sequence finish without receiving anything, which keeps the feature lively but occasionally anticlimactic.

What happened in testing

I saw the Vortex activate on my very first spin. That early appearance let me inspect its rotation and resolution order before any major feature interrupted normal play.

The animation adds welcome movement to otherwise familiar fixed-line spins. Still, I wouldn’t treat a Vortex landing as money already won, because its rearrangement can leave the reels without a match. Watch the final layout rather than assuming the Wild must rescue your spin.

Its first-spin appearance also showed how quickly the base game can interrupt its normal rhythm. I didn’t need to enter a separate screen or confirm anything before the rotation started. That speed keeps ordinary play moving, although you may want to slow down and inspect which positions changed. For my taste, the visual flourish earns its place because the finished payline result remains easy to verify.

Theme and First Impressions

This slot builds a glossy steampunk adventure around an inventor, his robot, and their hidden time machine. You get a clear story rather than a loose pile of brass-themed symbols.

Steampunk story and setting

A mustachioed general tries to discover the inventor’s secret machine. Brass gauges, blueprints, pressure controls, consoles, and a futuristic skyline fill the reels. Historical locations during bonus scenes extend that same time-travel plot beyond the base game.

Those feature screens feel connected to the central chase, not pasted onto an unrelated reel set. The premise isn’t subtle, but I think its animated cast has more personality than a generic mechanical slot.

Trivia: The inventor and his steam-powered robot hide a machine that can carry them through different periods of history.

Visuals and interface

Large character symbols and glossy 3D artwork make each reel easy to scan. The 5×3 board stays readable despite the busy machinery, and you can track the main controls without losing the story details.

My demo displayed a $1,000 balance and $0.90 default stake. Balance, stake, and win fields stayed legible during longer animations, which helped me verify every result.

Five by three board settled with $1,000 balance — The settled board shows every control.

Story-led slot fans should enjoy this lively presentation. You may find it excessive if you prefer stripped-back reels with minimal animation. Other Betsoft choices include The Hive!, The Exterminator, and Tycoons Plus.

The recurring brass hardware gives each screen a shared visual language. You can move from the reels into a historical scene without feeling as though another game suddenly appeared. I also appreciated the contrast between oversized character faces and smaller machine symbols. It creates a clear hierarchy, even when several reels show similarly colored metal parts.

Travel Through Time

Three Control Box symbols on reels 2, 3, and 4 trigger this second-screen cash feature. You press a red TRAVEL button, then the machine jumps between historical settings and reveals awards.

Trigger and travel sequence

The general first discovers the inventor’s hidden machine. Each button press moves you into another period and adds a cash amount. Stops continue until the sequence ends, with no promised duration or fixed total.

I like how this interaction breaks up standard reel play without asking you to learn a complicated pick system. The button creates anticipation, though your choice doesn’t appear to control the destination or award.

First bonus result

My first activation lasted five stops. I visited ancient Egypt, the age of dinosaurs, and Paris while collecting $9.00, $1.80, $2.70, $10.80, and $7.20.

Those five awards totalled $31.50, equal to 35x my $0.90 stake. That result arrived after a slow opening and gave my balance its first meaningful recovery.

A second Travel Through Time trigger appeared inside Free Spins later. You shouldn’t treat my five-stop route as a fixed pattern, since another activation can end differently. For me, the feature worked best as a short, story-led cash break rather than a huge jackpot chase.

The individual amounts also mattered more than one dramatic final reveal. I could see the total build after each journey, which made the $31.50 recovery easy to follow. If you enjoy active bonus screens, the repeated TRAVEL presses add a little ceremony. I’d still judge the feature by its collected cash, not by how many attractive locations appear.

Free Spins

Three Dinosaur scatters on reels 1, 3, and 5 start Free Spins. Each free spin selects a fresh 1x, 2x, 3x, or 5x multiplier for qualifying reel wins.

Scatters and spin multipliers

Both of my triggers awarded 10 Free Spins. The displayed multiplier applied to every regular reel win on that spin, but Travel Through Time cash awards didn’t receive it.

Other mechanics stayed active during the round. You can trigger Travel Through Time or gain extra Free Spins, which gives the feature more depth than a simple multiplier sequence.

Tip: Check the multiplier shown for each free spin, but remember that Travel Through Time cash awards aren’t multiplied by it.

Two tested rounds

My first round paid $45.60, about 51x the $0.90 stake. It included another time-travel trigger and became the largest result I recorded across 100 spins.

The second round returned $17.70, roughly 19.7x my stake. That clear gap shows why you can’t treat ten awarded spins as a predictable return, even when the rules stay identical.

I found Free Spins the strongest feature in my test because it combined multipliers with access to other bonuses. Yet two rounds offer only a snapshot, not an expected average. Give yourself enough stake room to handle normal spins while waiting for the three required Dinosaur positions.

Double Up

Double Up lets you risk an eligible win by choosing which robot hand hides a coin. A correct choice doubles the offered amount, while a wrong pick loses that gambled win.

Coin choice rules

The Collect control banks the displayed money instead of risking it again. You decide whether the possible double justifies exposing a completed payout to an immediate all-or-nothing result.

I never used Double Up during my test, so I won’t claim a personal result from it. Its rules are simple, but the feature doesn’t change the house edge or turn guessing into a reliable strategy.

When it is unavailable

Double Up doesn’t appear after Free Spins. It also disappears once Travel Through Time has triggered, so you can’t gamble those feature results through this screen.

If you prefer lower short-term risk, press Collect and keep the eligible win. The coin-in-hand setup adds character to a familiar gamble format, though I think banking the money makes more sense during an uneven session. Use it only when you’re comfortable losing the entire amount offered.

This choice becomes especially sharp after a small base-game payout. Doubling a minor amount may look harmless, but repeated guesses can erase several completed wins quickly. You don’t miss any core reel feature by collecting instead. I see Double Up as an optional thrill layered onto the game, not a necessary step toward the main bonuses.

How It Played Over 100 Spins

My $0.90 test finished $46.05 ahead, but two Free Spins rounds and two Travel Through Time bonuses drove that profit. You shouldn’t read the final balance without seeing the slow opening that came first.

Slow opening forty spins

I began with $1,000 and wagered $90 across 100 spins. My finishing balance reached $1,046.05, producing a $46.05 profit.

The first 40 spins gradually pulled the balance down to $980.95. Small wins ranged from $0.30 to a few dollars, and those base-game returns couldn’t keep pace with each $0.90 stake.

That opening felt noticeably flat despite occasional animations. You need enough bankroll space for quiet stretches because small line hits may slow a decline without reversing it.

Features changed the session

Travel Through Time arrived on spin 44 and lifted my balance to $1,009.75. Free Spins began on spin 56, included another time-travel trigger, and returned $45.60 as my largest feature result.

A second Free Spins round started on spin 91 and paid $17.70. My balance peaked at $1,053.40 before easing back to the $1,046.05 finish.

Four features across 100 spins made this a warm session. I enjoyed the sharp recoveries, but the profit depended on several bonuses landing after a prolonged weak start. Your practical lesson is simple: set a comfortable stake before the reels enter a quiet run.

The balance path mattered more than the final profit alone. If you had only seen the closing figure, you would miss the $19.05 decline before spin 44. My later high also sat $7.35 above the finish, so the last spins gave some money back. That uneven arc felt more informative than a simple win-or-loss label.

The Curious Machine Plus RTP and Volatility

The Curious Machine Plus RTP is 95.5%, its volatility is medium, and its maximum win is 1,666x the stake. You should treat that return as a theoretical figure, not a forecast for your next session.

Medium volatility still allows extended quiet spells and sudden feature-led balance changes. My $45.60 best result offered useful test context, but it doesn’t alter the stated payout ceiling.

1,000-spin simulator projection

The SatoshiHero Slot Simulator used these assumptions:

$0.90 stake.
95.5% RTP.
Medium volatility.
1,666x maximum win.
1,000 spins.

The median modeled session ended $46.40 down. Its P5-to-P95 range stretched from $199.90 down to $142.50 up, showing how widely one thousand spins may finish around that midpoint.

About 25% of modeled spins paid, while a feature appeared roughly once every 50 spins. The top-end modeled hit frequency sat near one in 13,889 spins.

1,000-spin projection with blue balance paths and percentile band — The projection fans around its midpoint.

You can use this model to understand possible spread, but it can’t predict random outcomes. I find the broad range more useful than the median alone because it exposes both meaningful losses and profitable runs.

Our 100-spin session

My live test ended $46.05 ahead after four natural feature triggers. The result landed on the positive side of the modeled possibilities, helped by bonuses on spins 44, 56, and 91.

The graph shows an early decline, sharp bonus-driven jumps, and a $1,046.05 finish. Those 100 spins provide first-hand context, but they can’t confirm or challenge the theoretical return.

$1,000 starting balance falling then rising above $1,046 — The balance jumps after bonus rounds.

Alert: A profitable 100-spin test doesn’t make the next session more likely to win. The simulator’s wide range shows how far short-term outcomes can move.

The published theoretical return describes the game’s mathematical expectation across a very large sample. One short test doesn’t change it, and feature-specific returns can differ by design when supplied. Judge stake comfort from possible balance swings, not from my profitable result.

Closing Thoughts

The Curious Machine Plus stands out through connected time-travel features, lively Wild movement, and unusually clear storytelling. Its main drawback is a prize ceiling that feels restrained beside such elaborate bonus scenes.

My Verdict

Patient feature hunters should try the demo before setting a real stake. You can expect familiar line wins, uneven base-game stretches, and occasional bonus jumps rather than constant momentum.

I liked how Free Spins and Travel Through Time changed my balance after a weak opening. I didn’t like relying on four feature triggers to keep a short session profitable, and I left Double Up untouched.

The Curious Machine Plus offers more mechanical variety than its simple 5×3 frame suggests. My test figures and simulator assumptions are checked regularly when verified information changes.

Pros:

Connected features: Bonus scenes continue the central time-travel story instead of interrupting it.
Clear line math: The line-bet system makes verified symbol awards easy to check.
Layered Free Spins: Random multipliers can combine with other naturally triggered features.
Readable interface: Detailed animations never hid my stake, balance, or win values.

Cons:

Modest ceiling: The top prize may disappoint players chasing very large multipliers.
Slow base stretches: Small line wins struggled to offset my stake early.
Restricted gamble: Double Up disappears after both major bonus features.

Best For: Story-led slot fans and patient bankroll managers get the strongest match here. You’ll get more from the game if you enjoy natural triggers, fixed paylines, and varied bonus scenes.

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