15 Coins Slot Review
Back in 1790, a London locksmith named Joseph Bramah stuck a padlock 🔒 in his shop window and dared anyone to open it for 200 guineas 💰.
The padlock stayed locked for 60 years! And then an American locksmith, Alfred Hobbs, finally picked it. It took Hobbs more than 51 hours across 16 days. I get annoyed when my own key sticks for a second.
The padlocked wooden Mystery symbols sitting among the coins 🪙 in 15 Coins slot from VoltEnt keep you waiting in the same way, because they stay shut until the end of the Hold the Jackpot bonus.
Gameplay
The reels sit in a gold frame against a magenta backdrop, with a dark medallion stamped with the number 15 in every empty position and the 4 jackpot panels lined up above the grid, which keeps what you're chasing in plain view.
The game has a 5x3 grid and no paylines, since prizes can only be won in the Hold the Jackpot bonus. The RTPRTP stands for “Return to Player.” The RTP describes the total bet amount that a game returns to players over millions of spins, and that figure is represented by a percentage. Table games, such as Roulette, typically have higher RTPs than many slots.
RTP needs to be considered in conjunction with a game’s volatility rate. is 96.07% and the volatility is variable.
The max multiplier is 1,000x and the max win is $100,000. Bets open at $0.10 and close at $100.
You pick between Low, Standard, High, Extreme and Double Extreme volatility levels.
The base game doesn't have regular pay symbols and a base spin pays nothing by itself. Landing 5 Bonus symbols on the middle row triggers the Hold the Jackpot bonus.
Cash symbols award 1x to 5x and Cash Infinity symbols award 5x to 10x, and both pay only at the end of the round.
There are 4 fixed jackpots above the reels: Mini (10x), Minor (20x), Major (50x) and Grand Jackpot (1,000x).
Cash Infinity symbols may land and lock in place until the round ends, and if it's on the middle row it raises the chance of starting Hold the Jackpot. Changing your bet level removes them.
Features
HOLD THE JACKPOT:
The round starts with 3 re-spins and every new Bonus symbol sticks to the reels, and resets the re-spin count to 3.
The Mini, Minor and Major symbols may land at random during the round, and more than 1 of the same type can be won in a single round.
The round ends when the re-spins run out or all 15 positions are filled. You win the sum of all Bonus symbol values, including any Mini, Minor and Major.
Landing any Bonus symbols in all 15 positions wins the Grand Jackpot. The symbol values on the reels aren't added to it.
COLLECTOR:
The Collector symbol adds up the values of all Cash and Cash Infinity symbols and multiplies the total by a random 1x to 20x.
MYSTERY:
Mystery symbols can turn into any other Bonus symbol except Cash Infinity. Jackpot Mystery symbols can only turn into Mini, Minor or Major. They open one by one at the end of the round.
CHANCE LEVEL:
Chance Level can be switched on in the base game at 2x, 3x or 5x. It multiplies the base bet by that amount and raises the chance of starting Hold the Jackpot by the same factor, while symbol values stay tied to the base bet.
BUY BONUS:
Hold the Jackpot can be bought on the Extreme and Double Extreme volatility levels, which the rules describe as having even bigger wins than the other levels.
GAMBLE:
The Gamble featureThis feature allows you to gamble your current winnings. It usually takes the form of guessing what color and/or suit a facedown card will reveal itself to be. A correct guess on the color pays 2x, while a correct guess of the color and suit pays 4x your bet. gives a chance to double a win for up to 7 rounds, and the doubled win can't go above $50,000.
The number of rounds depends on the max win available, and a loss forfeits the current win.
Performance
I played base spins and bonus rounds, including a board that got to 14 of 15 positions filled (1 short, naturally), and the game never froze or stuttered.
Maximum Win
The game can pay a max win of $100,000 if you hit the max multiplier of 1,000x at the top bet of $100. The smallest bet you can place is $0.10.
Conclusion
The slot's money comes through the Collector, which multiplies a collection of Cash and Cash Infinity values by up to 20x, and the Major Jackpot adding 50x on top.
The max multiplier is the Grand Jackpot, which means filling all 15 positions.
By my math, 15 top Cash symbols add up to only 75x before any Collector multiplier, so the Collector landing on a loaded board is the other route to a big number.
The RTPRTP stands for “Return to Player.” The RTP describes the total bet amount that a game returns to players over millions of spins, and that figure is represented by a percentage. Table games, such as Roulette, typically have higher RTPs than many slots.
RTP needs to be considered in conjunction with a game’s volatility rate. makes it a longer session game, which suits a game where only the round pays.
With volatility listed as variable, the swings depend on the level you pick, and with the max multiplier fixed, the higher levels just mean bigger swings on the way to the same cap.
Chance Level raises the trigger chance and the cost by the same factor, so it buys frequency and nothing else.
At 5x the Grand Jackpot works out to 200 times what you actually pay per spin, by my math. The Buy Bonus only exists on the Extreme levels, so the shortcut comes with bigger swings.
Patient players with a deep balance who can live through bonus droughts suit the game, and cautious low-bet players who want regular small wins should pass.
Slot Details
Game Provider: VoltEnt
Game Type: Video Slots
PaylinesPaylines are preset lines that run across the reels, and when you land matching symbols on them, that will result in a payout. The more paylines, the more ways you can win, but also the higher your bet per spin.: N/A
RTPRTP stands for “Return to Player.” The RTP describes the total bet amount that a game returns to players over millions of spins, and that figure is represented by a percentage. Table games, such as Roulette, typically have higher RTPs than many slots.
RTP needs to be considered in conjunction with a game’s volatility rate.: 96.07%
Volatility RateSlot games can have low, medium, high, or extremely high volatility rates (or a combination thereof).
The less volatile the game, the more often it should pay out, but the lower the amount, the less the payout, as this is in keeping with the risk you’re taking. Volatility rate should be considered in conjunction with a game’s RTP.: Variable
Bonus Round: Yes
Progressive: No
Free Rounds: Re-spins
Max Multiplier: 1,000x
Max Win: $100,000
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