Lost Mystery Chests Slot Review
Torches burn on hieroglyph-carved pillars, a chest of teal and green gems spills gold across the stone floor, and a cartoon explorer in a fedora keeps watch. The tomb Betsoft has built for Lost Mystery Chests is generous with its scenery and stingy with its reels, and that’s the whole design: the best-paying symbol in the game never lands on the grid at all – it has to be opened out of a box.
It’s a deliberately small game: a 3×3 grid, 10 fixed paylines and an RTP of 95.37%. The Mystery Chests carry the entire experience, giving a three-reel format a hidden layer it wouldn’t otherwise have. The studio’s catalogue – from Book of Helios to Trinity Reels and Golden Dragon Inferno – rarely leaves a grid this compact alone for long. Whether one closed box can carry a whole tomb is the question.
The 3×3 Reels and What They Pay
Three reels, three rows, ten fixed paylines. The game pays three of a kind on any line, the highest win per line is what counts, and wins on different lines are added together. Payouts scale with the selected bet, so the figures below move up and down with your stake.
Every symbol pays as a multiple of the total bet:
- Wild (Mystery Chest) – 25x for three
- Ankh – 5x for three
- Pyramid – 2x for three
- Rune (carved stone) – 0.5x for three
- Beetle – 0.3x for three
- Bird (pink carved stone) – 0.2x for three
That’s a short ladder, and it tells you what kind of game this is. On a 3×3 grid every winning line is a three-of-a-kind, so there are no four- or five-symbol steps to climb – the top of the paytable arrives on every win, or not at all.
The gaps between the rungs are steep. The Pyramid pays 2x where the Ankh pays 5x, and the three carved-stone symbols below it – the Rune, the Beetle and the pink Bird – all pay half a bet or less for three. Most of the time the grid is dealing you the bottom half of that ladder, which makes the wild worth chasing and the chest reveal worth waiting for.
The wild, revealed when a Mystery Chest opens, substitutes for every symbol except the Mystery Chests themselves, open or closed. It’s also the best payer on the reels by some distance: five times the Ankh, the next symbol down. Three wilds on a line at the 0.60 total bet pay 15.00, and no other symbol comes close to that.
Mystery Chests
Every spin carries a chance that three to five Mystery Chests land anywhere on the reels. They stay closed until the reels stop, which gives each landing a beat of anticipation the small grid wouldn’t otherwise have. When they open, each one reveals its prize: high-paying Ankh or Pyramid symbols, instant cash prizes, wilds, or even scatter symbols.
One rule shapes the whole mechanic: when multiple chests appear on the same spin, they all contain an identical symbol. There’s no mixed haul. Five chests opening onto the same wild or Ankh can fill several of the ten lines at once, which is where the format’s small grid stops being a limit and starts being the point.
The scatter is also the Mystery Chest symbol, so a chest reveal can turn into a feature trigger as well as a payout. A closed box on the reels is never just decoration; whatever’s inside, it counts. That single symbol doing double duty – reveal and trigger – is what threads the whole game together.
Free Spins
Land three or more scatter (Mystery Chest) symbols and the free spins round begins, with an instant payout on top:
- 3 scatters – 6 free spins plus an instant payout of 5x the bet
- 4 scatters – 8 free spins plus an instant payout of 10x the bet
- 5 scatters – 10 free spins plus an instant payout of 20x the bet
The round changes character because of one guarantee: three to nine Mystery Chests occur on every free spin, so no spin in the feature passes without the reveal. Up to five of those chests can carry the scatter symbol, and up to nine can carry other symbols. In practice that means every free spin looks like a busy base-game spin, only with the chest count pushed firmly upwards.
Free spins play at the bet of the triggering spin, and the round can be retriggered from within it. Because the chests on any given spin all open onto the same symbol, a nine-chest spin landing on wilds is the round’s ceiling moment – and the scatter-heavy spins are what keep retriggering it. That pairing, one big reveal plus the chance of more spins, is the whole rhythm of the feature.
Buy Feature
The Buy Feature skips the scatter wait and goes straight to the round, with at least three Mystery Chests guaranteed on every free spin. You choose how many spins to start with, and the three tiers cost 24.00, 31.80 and 39.60 at the game’s 0.60 total bet:
- 6 free spins – 24.00
- 8 free spins – 31.80
- 10 free spins – 39.60
Read as multiples, the per-spin cost works out to 4.00 for the 6-spin tier, 3.975 for the 8 and 3.96 for the 10. The guarantee of three or more chests on every spin is the same across all three, so the only thing the extra spend buys is extra spins for the reveals to land in.
Our Honest Verdict
Overall Rating: 7/10
Playing this is mostly watching closed boxes. Every spin, the reels fill with chests, they all open onto the same symbol, and the tomb either lights up or it doesn’t – there’s no in-between, no second mechanic to fall back on, and that single-mindedness is exactly why somebody would pick it over a busier game.
The identical-symbol rule is the best thing here, because on a ten-line grid it means one good reveal pays across several lines at once, and free spins push the chest count high enough for that to happen constantly. The weakness is everything outside the boxes: below the wild, the paytable is fractions of the bet, so the base game rarely produces a win worth the wait on its own symbols.
It suits players who like one strong mechanic doing all the work on a small grid, and it will leave anyone wanting layered features or a stated win ceiling wanting. The explorer gets a tomb with one door in it, but the door is worth opening.
Lost Mystery Chests FAQs
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What is the RTP of Lost Mystery Chests?
The RTP is 95.37%. -
How many paylines does Lost Mystery Chests have?
The game has 10 fixed paylines across a 3×3 grid. It pays three of a kind on any payline, with only the highest win per line counting and wins on different lines combined. -
How do the Mystery Chests work?
Every spin carries a chance that three to five Mystery Chests land anywhere on the reels. They stay closed until the reels stop, then open to reveal an Ankh or Pyramid symbol, an instant cash prize, a wild, or a scatter. When multiple chests appear on one spin, they all contain the same symbol. -
How do you trigger free spins in Lost Mystery Chests?
Land three or more scatter (Mystery Chest) symbols. Three scatters award 6 free spins and an instant payout of 5x the bet, four award 8 spins and 10x, and five award 10 spins and 20x. -
Can free spins be retriggered in Lost Mystery Chests?
Yes, free spins can be retriggered during the free spins mode. Three to nine Mystery Chests are guaranteed on every spin of the feature, and up to five of them can carry the scatter symbol, which is what feeds the retrigger. -
Can you buy the bonus on Lost Mystery Chests?
Yes. The Buy Feature sells instant access to free spins with at least three Mystery Chests guaranteed on every spin. The three tiers cost 24.00, 31.80 and 39.60 at the game’s 0.60 total bet, for 6, 8 and 10 free spins respectively. -
What does the wild do in Lost Mystery Chests?
The wild is one of the symbols a Mystery Chest can reveal when it opens. It substitutes for every symbol except the Mystery Chests themselves, open or closed, and it’s the best payer on the reels at 25x the total bet for three. -
What is the top-paying symbol in Lost Mystery Chests?
The wild, which pays 25x the total bet for three of a kind. It only appears when a Mystery Chest opens onto it, which is why the chest reveal matters so much: the paytable’s richest symbol can’t land on the reels any other way. Below it, the Ankh pays 5x and the Pyramid 2x.
