Joker Miner Slot Review
There's a field in Arkansas where anyone can pay to dig for gemstones 💎 and keep what they find.
Only 1 or 2 gemstones turn up a day, so most people leave with a sunburn and a bucket 🪣 of dirt.
Joker Miner slot from Endorphina turns that gamble into a feature, with a limited number of picks ⛏️ at a wall of gems and no way to know whether one will turn up a prize.
Gameplay
The reels sit in a timber-framed mine tunnel with glowing red, green, blue and orange crystals, with 5 minecarts parked on a heap of gold above the grid.
Joker Miner slot has a 5x4 grid with 25 fixed paylines, and wins pay left to right on adjacent reels starting from the leftmost reel. 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 96.05% and the volatility is high.
The max multiplier is 2,600x and the max win is $227,500, with bets running from $0.25 to $87.50. The game isn't available in Australian dollars.
Hold and WinThis feature plays out on a new screen. Typically, you get 3 re-spins (which could be re-triggered), and the triggering symbols usually stick to the position on which they land. Your objective is to land as many symbols as possible on the grid (you could land blank tiles, too). has 4 fixed jackpots: Min Jackpot (20x), Mid Jackpot (50x), Max Jackpot (100x) and Ultra Jackpot (1,000x). The jackpot pick game has 4 of its own: Min Jackpot (20x), Mid Jackpot (50x), Max Jackpot (200x) and Ultra Jackpot (500x).
Pick'em adds a Grand Gem prize of 2,500x, which is the biggest single award on any of the rules screens.
At the top of the paytable, the Gold 7 symbol pays 100x for 5-of-a-kind, the Red 7 pays 30x, the Bell pays 20x, and the Bar pays 10x.
The Watermelon and Strawberry pay 5x each, while the Lemon, Orange, Plum and Cherries are stuck at 2x each.
The Wild symbol only lands on reels 2 to 5 and substitutes for every other symbol except the Token symbols.
Coin Token symbols come in orange, purple, green, blue and red. They land on top of other symbols in the base game and are collected by the corresponding minecart above the reels.
Features
LUCKY TIME FEATURE:
The 5 minecarts above the reels, orange, purple, green, blue and red, each collect Token symbols of its own color. Once a Token lands, the matching cart can set off its feature, but only 1 can run at a time.
The orange minecart triggers a Hold and WinThis feature plays out on a new screen. Typically, you get 3 re-spins (which could be re-triggered), and the triggering symbols usually stick to the position on which they land. Your objective is to land as many symbols as possible on the grid (you could land blank tiles, too). with Boost symbols and the purple one a Hold and WinThis feature plays out on a new screen. Typically, you get 3 re-spins (which could be re-triggered), and the triggering symbols usually stick to the position on which they land. Your objective is to land as many symbols as possible on the grid (you could land blank tiles, too). with Collector symbols. The green one triggers Pick'em, the blue one the jackpot pick game, and the red one Free Spins.
Triggering a feature is random, so no matter how many Tokens are collected, it doesn't improve the odds.
HOLD AND WIN:
The reels grow to 5x4 and the cells spin independently. The feature starts with 3 re-spins, and any symbol that lands sticks in place and resets the re-spins back to 3.
Bonus symbols are valued from 1x to 18x, or the Min, Mid and Max Jackpots. Landing 20 symbols awards the Ultra Jackpot.
The minecart that triggered the Hold and WinThis feature plays out on a new screen. Typically, you get 3 re-spins (which could be re-triggered), and the triggering symbols usually stick to the position on which they land. Your objective is to land as many symbols as possible on the grid (you could land blank tiles, too). determines the extra symbol.
The Collector symbol gathers the values from the regular symbols on the board when they land and awards their total at the end of the feature.
The Boost symbol adds its value, from 1x to 10x, to every regular symbol on the reels and then turns into a regular Bonus symbol.
PICK AND CLICK:
This feature opens with a wall of 20 gems. Each gem hides a Grand Gem symbol or a prize from 2x to 50x. You get 10 picks, and every Grand Gem you find adds 1 additional pick. Finding 3 Grand Gems awards the Grand Gem prize.
The jackpot pick game hides its prizes in 20 minecarts, each holding one of the 4 jackpot awards or a prize from 5x to 15x. It ends when 3 awards of the same kind turn up, and everything is paid at the end.
FREE SPINS:
The red minecart triggers 20 Free Spins at the same bet as the main game, and they can't be won again during the feature. The 3rd reel is filled with Wild symbols on every spin, and Wild symbols can also land stacked on every reel.
GAMBLE:
In the Gamble, you choose 1 of 4 face-down cards and try to beat the Dealer's card. A higher card doubles your win and lets you try again, up to 10 attempts, and a tie lets you pick again with the win unchanged.
If the Dealer's card is higher, you lose the win and the Gamble ends. The Joker beats every card, and the Dealer never gets one.
The Gamble has its own 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. of 84%, and the game's 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. doesn't include it.
Performance
I spent a long session in the base game and the features, and the slot never stalled, froze or glitched.
Maximum Win
The max win is $227,500 and the max multiplier is 2,600x, reached at the top bet of $87.50. The smallest bet you can place is $0.25.
Conclusion
The money here comes from the minecart triggers, since every round starts when a cart fires at random and nothing you do speeds it along. Until one does, the base game tops out at a 5-of-a-kind on the Gold 7 symbol, so the waits are slow.
By my math, the Grand Gem prize covers nearly all of the max multiplier, and without it 10 picks at the best regular prize cap out at 500x on paper, so the top win needs 3 Grand Gems out of 20.
The Ultra Jackpot in Hold and WinThis feature plays out on a new screen. Typically, you get 3 re-spins (which could be re-triggered), and the triggering symbols usually stick to the position on which they land. Your objective is to land as many symbols as possible on the grid (you could land blank tiles, too). needs 20 special symbols, which is every cell on the 5x4 board, and the rules screens never show where the last 100x above the Grand Gem prize comes from, so the top win is a lottery ticket.
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 this a longer session game, but the volatility sits a tier above what that max multiplier pays for, so you're taking bigger swings for a smaller payoff.
There's no Buy Bonus or Ante BetAn Ante Bet is an option that costs a percentage of your bet but increases your chances of landing triggering symbols that initiate a feature., so every round waits on a cart firing.
The Gamble takes the whole win the first time the Dealer's card is higher, so I'd leave it alone.
Patient players with a deep bankroll are the target, while cautious low-bet players and anyone who wants a bigger top prize for the risk should pass.
Slot Details
Game Provider: Endorphina
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.: 25
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.: 96.05%
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.: High
Bonus Round: Yes
Progressive: No
Free Rounds: Free Spins, Re-spins
Max Multiplier: 2,600x
Max Win: $227,500
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