4 Mine Carts: Hold and Win drops you at the bottom of a glowing red canyon. Four overflowing carts sit on the track above the reels, painted red, blue, green and purple and piled high with gold nuggets and gemstones. 3 Oaks released it on 4 November 2026. My first session began with a 1,000 balance and a 1.00 bet, and a bearded miner in a blue helmet was already stacked down the middle reel.
Theme and Gameplay
The prospecting theme carries through every symbol. Oil lanterns, gold pans, green hard hats, a pickaxe and a backpack stuffed with gold sit alongside a cheerful golden retriever and the miner himself, with 10 to A filling the lowest tier. Gold nuggets hold cash prizes, and glowing gems mark the jackpot symbols.
The jackpot column on the left reads Mini 15, Minor 30, Major 75, Grand 1,000 and Royal 3,000 at a 1.00 stake, so every prize is a fixed multiple of your bet. A red Bonus button sits top right, and the spin, turbo and autoplay controls stack down the right edge.
Twenty-five fixed lines run across the reels starting on reel 1, and wins on different lines add together. The wild only appears on reels 2 to 5 and covers every regular symbol, but it won’t stand in for bonus or jackpot symbols.
Slot Features
During ordinary spins, nugget symbols are worth 1x to 5x your bet and jackpot gems are worth Mini, Minor or Major. Neither pays during normal spins. Every one of them wears a coloured cart label, and landing at least one labelled symbol can open the Bonus Game with the matching features switched on. Everything that triggered it locks in place, you get three respins, and each new symbol resets the count to three.
Red is Expand: every Expand symbol adds a row above the board, up to three extra rows, and each new row brings a random prize from 1x to the 75x Major. Blue is Power: a Power symbol sends you to a separate six-reel mini game after the main round, where filling all six reels adds an x2 to x10 multiplier before the total is dropped back onto the Power symbol’s position.
Green is Collect, which sweeps up every bonus, jackpot and Expand prize currently showing. Purple is Multi, which fires randomly and stamps x2, x3 or x5 onto one or more symbols, and repeated hits on the same symbol multiply together.
RTP and Win Potential
Its return to player is 95.58%, a touch under the industry average. The top win reaches 4,781x, which comes from a full Royal Grand plus the symbol prizes collected along the way.
The bet runs from 0.10 to 32 per spin. Two bonus buys are on offer: the Random Bonus at 100x your bet starts the round with one to four features, and the Super Bonus at 200x guarantees all four. It plays at medium volatility, which suits the frequent nugget hits and the fairly modest jackpots.
My Thoughts On This Slot
I enjoyed working out which carts would join each bonus. Since a single labelled symbol can start the round, bonuses come along more often than in most respin games, though a one-colour trigger can feel thin. On paper the strongest pairing is Expand with Collect, since the extra rows keep feeding new prizes for the green cart to gather.
The Power mini game is a neat extra, but the 95.58% RTP and the steep 200x Super Bonus make me cautious about buying in.
