Steam Tower Slot Review
A gentleman in a top hat and red cape stands at the edge of a cobbled plaza, brass machinery strapped to his back and steam curling from the boiler beside him. Up through the green haze, someone needs rescuing, and NetEnt has made every rung of that steampunk rescue an excuse to pay you a little more.
It’s an unusually generous game on paper. Steam Tower runs at 99.06% RTP on a 5×3 grid with 15 bet lines, stakes from 0.15 to 150, and a 1,000x win ceiling. The studio behind Starburst and Gonzos Quest has rarely given a slot away this cheaply, and the tower’s sixteen-floor climb is the reason it can afford to.
The Reels and the Paytable
Wins pay left to right across the 15 bet lines, and only the highest combination on each line counts. That’s the whole of the pay mechanics; there’s nothing exotic hiding in the base game. The reels sit in an ornate brass housing with bolted corners and gear trim, and the symbols are the expected mix of steampunk cast and royals.
Four picture symbols lead the table, with the card royals filling out the lower rungs:
- Red Eye – 3 pays 2.00, 4 pays 20.00, 5 pays 100.00
- Man in Top Hat – 3 pays 1.50, 4 pays 15.00, 5 pays 50.00
- Blonde Woman – 3 pays 1.25, 4 pays 10.00, 5 pays 25.00
- Steam Tower Icon – 3 pays 1.00, 4 pays 5.00, 5 pays 15.00
- A – 3 pays 0.75, 4 pays 2.00, 5 pays 7.50
- K – 3 pays 0.35, 4 pays 1.00, 5 pays 5.00
- Q – 3 pays 0.25, 4 pays 0.75, 5 pays 3.75
- J – 3 pays 0.15, 4 pays 0.50, 5 pays 2.50
The gaps between tiers are steep. Five Red Eyes pay a hundred times the line stake, while five Queens pay less than four. Landing the top picture symbols in the base game is where the real money sits, because everything the bonus round adds is built on these same values.
The mid-tier symbols hold the middle ground. The Man in Top Hat and the Blonde Woman both pay well enough at four and five of a kind to matter during a multiplied free spins run, and the Steam Tower Icon sits just behind them.
The royals are filler, but not useless filler. At x5 or x7 in the bonus round, even a five-of-a-kind of Js becomes a return worth noticing, and the smaller three-of-a-kind royals are what keep a spin’s balance ticking over while you wait for the picture symbols to line up.
Notice too how the table is built to be multiplied. The jump from three to five Red Eyes is fifty-fold, and the equivalent jumps on every symbol below it are almost as violent. That shape only makes sense with a multiplier ladder stacked on top, which is exactly what the free spins round supplies.
The wild substitutes for every symbol in the game, and that single line matters more here than it usually would, because wilds are also the fuel for the entire bonus climb. There’s no scatter anywhere on the reels, which tells you how the game wants to be played: watch the wilds.
Betting is straightforward. The game can be played with cash or coins, with the bet level set through the level selector, and stakes run from 0.15 up to 150 per spin.
Autoplay carries stop options that can be cleared with a reset, and some stop settings are mandatory in certain jurisdictions. Beyond that, the controls are standard NetEnt fare, and the settings you’d expect, from coin value to autoplay limits, are all in their usual places.
The Tower Climb: Stacked Wilds and Free Spins
Stacked Wilds
Only the main game pays out the trigger. A Stacked Wild filling an entire reel awards 10 free spins and moves you onto floor one of the tower. Nothing else gets you in; there’s no scatter, no buy option and no second route.
Once inside, every wild that lands anywhere on the reels adds two more free spins and ascends the tower one floor, all the way to floor 16 at the top. On the top floor, wilds keep adding two spins without moving you anywhere, because there’s nowhere left to go.
That’s the shape of the round: ten spins to start, and every wild along the way extends the climb while raising the floor. A round that runs cold on wilds burns through its spins quickly. One that keeps landing them can go on far longer than the initial ten.
The Multiplier Ladder
During free spins, all bet line wins are multiplied by a floor-dependent multiplier, updated before each spin. The ladder steps up in blocks of three floors:
- Floor 1-3 – x2 multiplier
- Floor 4-6 – x3 multiplier
- Floor 7-9 – x4 multiplier
- Floor 10-12 – x5 multiplier
- Floor 13-15 – x6 multiplier
- Floor 16 – x7 multiplier
Reaching floor 16 also pays a bonus win of 66.6666666666667 times the bet on top of everything else, so the summit is worth reaching for its own sake. You don’t need a winning spin to collect it; arriving is enough.
Three meters keep the climb legible. The Floor Meter shows where you are, the Multiplier Meter shows the current multiplier, and the Tower Meter shows both together against the tower itself, so your position and your payout rate are always visible at a glance.
Because the multiplier updates before each spin rather than after each win, the timing of a wild matters. A wild that lands on the last spin of floor three lifts you to floor four, and the next win is already being paid at x3.
The climb is a chain, and every link is a wild. Floors one through fifteen each demand a wild arrival to unlock the next step, which means the ladder rewards exactly one behaviour: keeping wilds landing.
The round has no hard spin limit, only the tower’s ceiling. Spins keep arriving as long as wilds keep appearing, so a long run on floor 16 is the practical endgame: x7 on every win, two more spins for every wild, and the arrival bonus already banked.
Our Honest Verdict
Overall Rating: 7.8/10
Most of the time you’re grinding a plain 15-line base game and rescue mission aside, the girl in the tower doesn’t get any closer. The reason to sit through that is the arithmetic: every single wild is forward motion, no exceptions, and that consistency is the game’s best quality. A climb that finds its wilds can run a long way past its ten free spins, and the multiplier quietly doubling and tripling as you go makes even modest wins feel like progress.
What it never becomes is rich. The x7 summit and the arrival bonus are small beer next to what newer towers pay out, so the big-win hunter is climbing the wrong building. But a slow grind with a fair return is a legitimate way to spend an evening, and at 99.06% RTP this is about the fairest grind going. Climb it for the patient pleasure of watching the number grow, not for the view from the top.
Steam Tower FAQs
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What is the RTP of Steam Tower?
Steam Tower runs at 99.06% RTP, one of the highest figures you’ll find on any online slot. -
How do you trigger free spins in Steam Tower?
Land a Stacked Wild covering a full reel in the main game and the round begins: 10 free spins, starting on floor one. There is no scatter symbol; the Stacked Wild is the only trigger. -
What does a wild do during free spins in Steam Tower?
Each wild that lands anywhere on the reels during free spins adds two extra spins and ascends the tower one floor. On floor 16, the top floor, wilds still add two spins each. -
What do you get for reaching the top floor in Steam Tower?
Floor 16 carries a x7 multiplier on all bet line wins, plus a bonus win of 66.6666666666667 times your bet awarded when you reach it. -
What is the maximum win on Steam Tower?
The maximum win is 1,000x your bet. -
What is the hit frequency of Steam Tower?
Roughly 33%, so about one in three spins produces a win of some kind. -
How many paylines does Steam Tower have?
Steam Tower is a 5-reel, 3-row video slot with 15 bet lines. -
What are the minimum and maximum bets on Steam Tower?
Stakes run from 0.15 to 150 per spin.
