Doom’s Digging Machine: Slot Overview

We’re accustomed to developer Octoplay slamming characters into each other in its Showdown Spins slots; this time the studio is busy smashing its way underground instead. Enter Doom’s Digging Machine, a mining-themed slot focused on digging deep, collecting valuable minerals, and hoping to hit it big beneath the surface. Players aren’t left to roam freely down there, and they’re not accompanied by the usual cheerful, bearded prospector that dominates the mining-slot scene. Instead, a partly robotic companion—Doom, presumably—tags along in a scatter pays slot featuring multipliers, Mystery Artefacts, and free spins.

Along with ditching the classic prospector, Octoplay has also avoided the standard mining-slot look, so it doesn’t feel like you’re descending a timber-braced shaft with creaking supports overhead. Doom’s Digging Machine is closer in vibe to Relax Gaming’s TNT Tumble, where the metallic device (the game grid) seems to bore downward into the earth. A different approach is welcome, and this presentation helps Doom’s Digging Machine stand apart from other mining titles, even if it slightly resembles something Peter & Sons might create, and its lead character looks like he could be related to Cyborg from Teen Titans.

Since it’s a scatter paying slot, wins are formed when 8 or more matching symbols land anywhere across the grid. Symbols don’t have to connect, and there are no paylines or ways involved. Icons drop into a 5-reel play area with 6 symbols per reel, driven by a low-medium (2 out of 5) math model. The stake range runs from 10 c to $/€200, with an RTP of 95.7%, nudging up to 95.81% when the Double Chance ante bet is enabled. The upside of the ante bet is that it doubles the chance of activating free spins, in exchange for adding 40% to the stake.

The paytable contains 9 standard paying symbols. Starting from the lowest, there are diamond, triangle, heart, pentagram, and octagonal shapes, followed by a bone hand clutching a gem, plus three gem-studded skulls. Scatter wins with 8 of these symbols return 0.2 to 10 times your bet, while at the top end, a 12+ OAK result pays 2x to 50x. Doom’s Digging Machine doesn’t use wilds, but it does include a cascade mechanic that removes winning symbols after they pay, then drops new symbols down to refill every empty position.

Doom’s Digging Machine: Slot Features

Mystery Artefacts add extra spark to Doom’s Digging Machine in both the base game and the free spins round, which can be triggered naturally or accessed via purchase.

Mystery Artefacts

There are two types of Mystery Artefacts that can appear on the grid: the 2×2, which awards an x3 multiplier, and the 3×3, which awards an x5 multiplier. Each Artefact uncovers matching symbols and provides a global win multiplier that affects all wins until the spin ends. If multiple Artefacts land in the same spin, their multiplier values stack together, up to a maximum of x100.

Free Spins

Landing 3 scatter symbols in one spin grants 10 free spins. Each extra triggering scatter beyond 3 adds +5 free spins, up to a maximum of 30. Any scatter that lands during the feature awards an additional  +1, +2, +3, +5, or +10 free spins and increases the win multiplier by the same amount. In free spins, the win multiplier does not reset.

Feature Buy

By paying 150 times the bet, players can purchase direct entry to the free spins round. Doing so comes with an RTP of 95.87%.

Doom’s Digging Machine: Slot Verdict

Like most slot categories, mining slots come in many different styles. From the hard-edged, pickaxe-on-bare-rock feel of Dead Canary or Fire In The Hole 2 to the more casual-friendly Gold Digger from iSoftBet, there’s something for a wide range of risk/reward preferences while hunting treasure underground. Doom’s Digging Machine feels like a well-crafted option in the “softer” end of the mining-slot spectrum. Its low/medium volatility supports that, and players who enjoy this type of setup should find plenty to like in the visuals and features it keeps feeding into the action.

What helps keep Doom’s momentum going is its ability to link multiple cascading tumble wins together when things line up, while boosting the sequence with Mystery Artefact reveals and a global win multiplier. It’s not the most groundbreaking feature mix ever discovered in a slot, but it’s implemented effectively here and can unearth wins up to 5,000x the bet. That’s clearly not the largest haul a mining slot can offer, but it feels like a sensible ceiling for the kind of players Doom’s Digging Machine appears designed to appeal to.

After pushing through several Octoplay fight slots, including Legends Battle For Earth, Doom’s Digging Machine was a refreshing switch-up. As with any game, it won’t suit every gambling taste, but it’s easy to see why some players could be drawn in by its cartoony, slightly retro style, its specific math model, and its smooth, interconnected gameplay.