Diamond Heist (CORE Gaming) – Review & Demo Play

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Review

First look at Diamond Heist Hold & Win

Diamond Heist Hold & Win is a bank robbery video slot from iSoftBet, built on a 5x3 grid with 20 fixed paylines. Its main hook is the combination of Heist Mode, Random Modifiers and Diamond Heist Respins, with a sixth reel appearing during the heist sequence as visual decoration rather than an extra playable reel. My first impression was lively and polished, although the vault imagery and looping soundtrack feel familiar.

Diamond Heist symbol behaviour

Regular symbols run from 10, J, Q, K and A through banknotes, a watch, gold bars, diamonds and the Master Thief. Five high-paying symbols return between 3x and 25x the stake, while the lower symbols pay between 0.75x and 2x for five. The Wild substitutes for regular symbols, but it cannot replace Diamonds, Detonators or the Scatter.

Symbols and payouts

Wild

Replaces regular paying symbols but not Diamond, Detonator or Scatter symbols.

Scatter

Three or more Scatter symbols trigger Free Spins, with the award depending on the number landed.

Detonator

Three Detonator symbols trigger Heist Mode and award 20 Heist Spins.

Diamond

Five or more Diamonds during Heist Mode trigger Diamond Heist Respins, where each Diamond carries a prize value.

Green Key

A Green Key resets the respins and unlocks an additional reel row during Diamond Heist Respins.

Master Thief

The highest-paying regular symbol pays up to 25x the stake for five matching symbols.

5

x25

Bonus mechanics under pressure

Random Modifiers can land on any base game spin. Wilds Added places 3 to 6 Wilds, Mystery changes 5 to 10 positions into one symbol type, and Multiplier Win applies x2, x5 or x10 to the next winning spin. These moments keep the base game from becoming completely flat, but they arrive irregularly, so I never treat them as a reliable session plan.

Three, four or five Scatters award 8, 10 or 12 Free Spins. The multiplier begins at x1 and increases by one after every spin, with extra Scatters able to add 3, 5, 10 or 12 spins. Three Detonators instead trigger 20 Heist Spins; five Diamonds then unlock Diamond Heist Respins, where sticky Diamonds reset three respins and Green Keys can expand the layout to six rows.

Bonus features

Random Modifiers

A random base game modifier adds 3 to 6 Wilds, changes 5 to 10 symbols into one matching type, or applies an x2, x5 or x10 multiplier to the next winning spin.

Free Spins

Three, four or five Scatter symbols award 8, 10 or 12 free spins. The multiplier starts at x1 and rises by one after every spin, while additional Scatters can add more spins.

Heist Mode

Three Detonator symbols award 20 free Heist Spins with Diamond symbols added to the reels. Five or more Diamonds move the feature into Diamond Heist Respins.

Diamond Heist Respins

Five or more Diamonds award three respins. New Diamonds become sticky and reset the respins to three, while Green Key symbols unlock extra rows and jackpot symbols can award Mini, Major or Mega prizes.

The mental cost of dry streaks

RTP sits at 96.0%, hit frequency is 26.5%, and the listed maximum win is 5,105x the bet. Those figures do not soften the session experience. This slot tests your nerves because the dry streaks pile up quick, then a Random Modifier or bonus arrival can suddenly change the pace. I'll be honest, I lost it, and tilt cost me more than the variance did.

With hindsight, the sensible approach is a firm stake limit and a short review point after every block of spins. I got played mentally by waiting for Free Spins after several quiet stretches, even though the game gave no reason to expect them. The base game grinds you down when regular wins fail to connect with a feature, so I walked away before it got worse.

Gallery of video and screenshots of the game

Diamond Heist. Diamond Heist from CORE Gaming

Reel Screen. Diamond Heist from CORE Gaming

Win Screen. Diamond Heist from CORE Gaming

Win Screen 2. Diamond Heist from CORE Gaming

Win Screen 3. Diamond Heist from CORE Gaming

Win Screen 4. Diamond Heist from CORE Gaming

Symbols. Diamond Heist from CORE Gaming

Symbols 2. Diamond Heist from CORE Gaming

Features. Diamond Heist from CORE Gaming