Boomerang Jack S Lost Mines Slot Review
Down a lantern-lit shaft somewhere in the outback, timber frames and stacked crates line a rail track that runs off into the rock, and Boomerang Jack S Lost Mines makes that mine feel like a place you could easily get lost in. It’s a warm, textured setting for a game that hides its real prizes deep below the surface: three gem symbols that can fire alone or combine into something much bigger.
Red Rake Gaming have built it on a 5×4 grid with 50 paylines, a 95.3% RTP and mid to high volatility, and it’s a busier engine than the Million 777 series this studio is better known for, closer in spirit to Million Zeus 2 and Piggy Vegas. Whether a paytable this thin can carry a game is the question the gems exist to answer.
The Mine Floor: Symbols and Paylines
Wins pay on adjacent reels from left to right and from right to left, so combinations landing on the left three or four reels count just as much as ones starting from the right. Where a line pays more than one win, only the highest is counted. Fifty fixed paylines carry all of it.
The wild appears only on reels two, three, four and five, and it substitutes for everything except the three gem symbols. That restriction matters more than it sounds, because the gems are the whole game.
The paytable pays as multiples of the total bet:
- Chest – 2x for three, 4x for four, 20x for five
- Man or Crocodile – 0.8x for three, 2x for four, 10x for five
- Koala – 1x for three, 1.3333x for four, 2x for five
- Kangaroo – 0.8x for three, 2x for four, 2x for five
- A – 0.4x for three, 0.8x for four, 6x for five
- K – 0.4x for three, 1x for four, 4x for five
- Q, J or 10 – 0.4x for three, 0.8x for four, 2x for five
Stakes run from 0.10 up to 25 per spin. The top of the paytable is modest: 20x the total bet for five chests, which tells you most of the real money in this game lives in the features rather than the reels.
Three Gems, Three Features
Every spin can carry three special symbols at once: a green Gem Coins gem, a red Diamond Wins gem and a blue Reel Expand gem. Land one or more of any single gem anywhere on the reels and it may randomly launch its own free spins round. That “may” is doing real work, so a gem sighting isn’t a guaranteed trigger.
- Gem Coins (green) – five free spins
- Diamond Wins (red) – eight free spins
- Reel Expand (blue) – five free spins
- Any two gems together – eight free spins with both features’ rules
- All three gems together – ten free spins with everything running
Gem Coins
The green gem brings five free spins. Each coin that lands during the round pays out immediately, starting at twice the triggering bet, and every additional coin adds a free spin while raising the coin value for the spins that follow.
It’s a compounding loop. The longer the round runs, the more each new coin is worth, so a cluster of coins early on can snowball the later spins into something much larger than the round started as.
Diamond Wins
The red gem opens eight free spins, and it’s the round with the jackpot ladder attached. Symbols landing during the feature can pay extra spins, a direct win, or a coloured diamond (green, red, purple or blue) to obtain the Mini, Minor, Major or Grand wins.
Diamonds fill slots on the matching award panel, and a full panel pays its jackpot and resets. More than one jackpot can land in a single round, so a hot sequence of diamonds can pay Mini, refill, and climb again before the spins run out.
The ladder sits in a side panel, and its values scale with the stake rather than sitting as fixed prizes. Grand sits at the top, then Major, Minor and Mini below it, with each step paying proportionally wherever the stake sits.
Reel Expand
The blue gem is the simplest of the three: five free spins, with no ladder and no compounding coins.
Combined Features: Two and Three Gems Together
The interesting part is what happens when the gems mix. Any combination of two different gem symbols can randomly launch a combined round of eight free spins that applies both features’ rules at once, so a green-and-red pairing runs the coin compounding and the jackpot ladder side by side.
Land at least one green, one red and one blue gem on the same spin and the full combined round can fire: ten free spins running Gem Coins, Diamond Wins and Reel Expand together, each with all of its own rules intact. That’s the round the whole game is angled towards.
There’s no bonus buy here, so the gems and their combinations are the only route in. Everything has to be earned on the reels, one spin at a time.
Our Honest Verdict
Overall Rating: 7/10
This is a slot you play with the paytable switched off in your head. The reels exist to deliver gems, and every session is really a slow walk deeper into Jack’s mine waiting for three colours to show up on the same spin. The one reason to choose it over a simpler Red Rake game is that full ten-spin round, and it delivers: coin values climbing, the ladder filling, the bet lines widened, all running together.
The strength is the combining itself, and the Diamond Wins ladder resetting mid-round, which means one round can pay the same jackpot twice. The weakness is everything before it. Singles are small features, the two-gem rounds sit awkwardly between the parts and the whole, and a thin paytable means long stretches of the base game paying almost nothing while you wait.
So it’s for players who enjoy a long build towards one big combined round, and it’s not for anyone who wants the base game to pull its own weight. Jack’s mine pays the patient ones well.
Boomerang Jack S Lost Mines FAQs
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What is the RTP of Boomerang Jack S Lost Mines?
Boomerang Jack S Lost Mines runs at an RTP of 95.3%. -
Is Boomerang Jack S Lost Mines high volatility?
It’s rated mid to high volatility, so wins can be spaced out with the bigger payouts concentrated in the free spins features. -
How do you trigger the free spins in Boomerang Jack S Lost Mines?
Landing one or more gem symbols (Gem Coins, Diamond Wins or Reel Expand) anywhere on the reels may randomly launch that gem’s free spins feature. A combination of two gems can trigger an eight-spin combined round, and one green, one red and one blue gem together can trigger a ten-spin round with all three features at once. -
How does the Diamond Wins feature work?
Diamond Wins awards eight free spins. Symbols landing during the round can pay extra spins, direct wins or coloured diamonds that fill the Mini, Minor, Major or Grand jackpot panels. Fill a panel and that jackpot is paid, with the panel resetting afterwards, and more than one jackpot can be won in a single round. -
Does the Gem Coins feature increase in value?
Yes. Each Gem Coins feature starts with coins worth twice the triggering bet, and every coin that lands adds a free spin and raises the coin value for the spins that follow, so the round compounds as it runs. -
What does the Reel Expand feature do?
It awards five free spins played on an expanded set of bet lines, giving the grid more winning coverage for the duration of the round. It’s the simplest of the three gem features. -
What is the minimum and maximum bet on Boomerang Jack S Lost Mines?
Stakes start at 0.10 per spin and go up to 25. -
Who makes Boomerang Jack S Lost Mines?
Red Rake Gaming, the studio behind the Million 777 series and titles like Million Zeus 2 and Piggy Vegas.
