Professor Clank’s Combinator Slot Review
Most cascading slots keep the chain going as long as anything wins; Professor Clank’s Combinator cuts the chain the moment a drop stops improving on the last one, which makes every spin a question of momentum rather than luck. It’s a small change with big consequences, and it’s the reason this machine feels different to spin than the dozen other drop games it sits beside. The setting sells it too: a riveted brass-and-iron combinator bolted into a stone furnace pit, molten light pouring up from below, with a copper-plated robot watching from behind the pipework.
It’s a ReelPlay release running at 96.1% RTP and low volatility, with a 10,000x top prize and a hit frequency of 24.5%. Six columns up to five rows high give up to 707 adjacent ways, and the scatter-hold bonus with its gamble is where the money lives. It shares DNA with Fruit Combinator and Hyper Respins.
Base Game & Features
Wins pay left to right on adjacent columns, and only where the symbols sit on adjacent rows. Stakes run from 0.20 to 25 per spin, with the base bet working out at a twentieth of the total. It sounds fussy, but the base bet only matters when you price the bonus buy.
The Drops Mechanic
Every spin is a Base Drop. After explosions, morphs and boosters do their work, a new symbol drops onto the top of any column holding fewer than five symbols. Dropped symbols that don’t match or substitute for the current paying symbol are exploded on arrival. Ones that match but land outside a paying position go the same way.
Matching symbols that land in paying positions are kept, and scatters are always kept. The twist is in the continuation rule: a fresh drop only triggers when the total symbol win beats the previous drop. Chain enough improving drops and the wins stack up; one weak drop and everything settles. Wins are paid once no more drops trigger.
The Professor is wild and substitutes for everything except the scatter, though he never shows up on the first or last column.
Paytable
All values are multiples of the total bet.
- Top symbol: 6 pays 10x, 5 pays 5x, 4 pays 2.5x, 3 pays 1.25x
- Second high symbol: 6 pays 4x, 5 pays 2x, 4 pays 1x, 3 pays 0.5x
- Third high symbol: 6 pays 2.5x, 5 pays 1.5x, 4 pays 0.75x, 3 pays 0.25x
- Fourth high symbol: 6 pays 2x, 5 pays 1x, 4 pays 0.5x, 3 pays 0.25x
- Low symbols (first set): 6 pays 1.2x, 1x or 0.9x; 5 pays 0.6x, 0.6x or 0.5x; 4 pays 0.3x across the set; 3 pays 0.2x, 0.15x or 0.15x
- Low symbols (second set): 6 pays 0.7x, 0.6x or 0.5x; 5 pays 0.5x, 0.4x or 0.4x; 4 pays 0.25x, 0.25x or 0.2x; 3 pays 0.15x, 0.1x or 0.1x
Only the highest win per combination counts, and coinciding wins are added together. It’s a modest paytable at the bottom end, which is what you’d expect from a game that pays its real money through scatters and the bonus ladder.
Professor Clank’s Combinator Bonus Respins
Five or more scatter symbols trigger the Bonus Respins, and only once every base game drop has finished. The scatters are the glowing blue gears, and they can’t be missed when they land.
When the round starts, every non-scatter symbol explodes and the remaining scatters drop to the bottom of their columns. Three respins are awarded. Each column short of five symbols gets a fresh drop, and any non-scatter that arrives is removed immediately. Scatters hold their positions.
Land a new scatter and the respin count resets to three. That’s the whole engine of the round: fill the grid, keep resetting, and every scatter in place at the end awards a prize. Symbol pays from the paytable don’t apply during respins.
The Prize Ladder
Every scatter pays something at the end of the round. The fixed bonus prizes are:
- Bronze: 10x the total bet
- Silver: 50x the total bet
- Gold: 250x the total bet
- Platinum: 2,000x the total bet
- Non-bonus scatter prizes: 1x to 100x the total bet
The bonus prizes aren’t progressive, and the round plays at the bet of the triggering spin.
The Gamble
When the respins finish, the total win can be gambled. You can wager all or half of it, up to three times where the balance allows, and collect at any point. The available multipliers and their odds:
- 1.25x at 4 in 5
- 1.5x at 2 in 3
- 2x at 1 in 2
- 2.5x at 2 in 5
- 3x at 1 in 3
- 4x at 1 in 4
- 5x at 1 in 5
- 10x at 1 in 10
Any gamble combination that would push the total past 10,000x the bet is disabled, and fractional payouts are rounded down to a wager that produces a whole win. It’s a proper gamble rather than a token one, and the 10x option is a genuine shot at turning a modest respin round into something serious.
Bonus Buy
Where jurisdictions allow it, the Bonus Respins can be bought outright at 1,000x the base bet, which works out to 50x the total bet. The bought game plays at base bet x 20 and always produces five or more scatters. The buy runs at 97.1% RTP, a full point above the standard game.
Our Honest Verdict
Overall Rating: 7.3/10
Spinning Professor Clank’s Combinator is a bit like stoking a boiler: most spins fizzle quickly, and then a chain catches and the whole machine wakes up. You play it for that feeling, and for the scatter round at the end of a good run, which is where this workshop does its real business.
The bonus is the best thing here. The reset-on-every-scatter rule means a round can keep breathing long after it should have died, the fixed ladder pays properly for a full grid, and the gamble is generous enough to matter rather than decorative.
The base game is where it sags. The symbol pays are thin, a chain that stalls twice pays almost nothing, and even the low volatility can’t fully hide how little arrives between bonuses. It’s one for fans of chain reactions and hold-and-respin chases who don’t mind a quiet grind to earn the good room; anyone wanting big standalone symbol wins won’t find them here. For the right player, the old machine delivers.
Professor Clank’s Combinator FAQs
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How do you trigger the Bonus Respins in Professor Clank’s Combinator?
Five or more scatter symbols appearing anywhere starts the Bonus Respins, but only after all base game drops have finished. Scatters are the glowing blue gear symbols. -
How does the respin reset work in the bonus round?
You start with three respins. Every time a new scatter lands, the count resets to three. Non-scatter symbols that drop in are removed immediately, and each scatter in place at the end awards a prize. -
Can you gamble your winnings in Professor Clank’s Combinator?
Yes. After the Bonus Respins finish you can gamble all or half of the win, up to three times, choosing multipliers from 1.25x up to 10x. You can collect at any point, and gambles that would exceed the 10,000x cap are disabled. -
Can you buy the bonus on Professor Clank’s Combinator?
In jurisdictions where it’s offered, yes. The Bonus Respins cost 1,000x the base bet, which is 50x the total bet, and the bought round always starts with five or more scatters. The buy runs at 97.1% RTP. -
What is the RTP of Professor Clank’s Combinator?
96.1% in the standard game, rising to 97.1% for the bonus buy where available. -
Is Professor Clank’s Combinator high volatility?
No, it’s a low volatility game with a hit frequency of 24.5%, so wins land fairly often even if many of them are small. -
How many ways to win does Professor Clank’s Combinator have?
Up to 707 adjacent ways, on a six-column grid that can reach five rows. Winning combinations need matching symbols on neighbouring columns and rows, starting from the left. -
What is the maximum win on Professor Clank’s Combinator?
10,000x the total bet. The same cap applies to the gamble feature, and any combination that would exceed it is disabled.
