Diamond Charge Hold & Win Slot

2.4/5
Based on our expert’s review. Reviewed by
Iron Dog Studio Slot Reviews
Review by
Olamidotun Otis
Review by
Olamidotun Otis

Diamond Charge Hold & Win is a high-voltage slot coming out on September 3, 2025, by Iron Dog Studio. It’s another addition to the developer’s growing catalogue of Hold & Win slots, unfolding on 5 reels with 30 paylines. As usual, the Hold & Win is at the centre of the action and awards prizes with the Cash Collect mechanic. The top reward is 5,000x the bet. See how this supercharged slot comes together in my Diamond Charge Hold & Win review.

Max Win
5,000x
Play
T&Cs Apply

New UK certified players only | Valid mobile number required | No deposit needed | 25 Free Spins on Book of Dead each valued at 10p | 40x wagering on Free Spins winnings | Ends 30.09.2025 |  T&Cs apply #ad

Provider
Iron Dog Studio
Type of Slot
Video Slot
Theme
Diamonds
Reels
5
Paylines
30
Stakes Range
10p–£50
Bonus Features
4
Free Spins
No
Multiplier
No
Max Win
5,000x
RTP
95.1%
Volatility
High

Diamond Charge Hold & Win Demo

18plus uk gambling commission online-slot.co.uk logo agechecked verification provider
T&Cs Apply New UK certified players only | Valid mobile number required | No deposit needed | 25 Free Spins on Book of Dead each valued at 10p | 40x wagering on Free Spins winnings | Ends 30.09.2025 |  T&Cs apply #ad
18plus uk gambling commission online-slot.co.uk logo agechecked verification provider
T&Cs Apply New UK certified players only | Valid mobile number required | No deposit needed | 25 Free Spins on Book of Dead each valued at 10p | 40x wagering on Free Spins winnings | Ends 30.09.2025 |  T&Cs apply #ad

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Diamond Charge Hold & Win Slot RTP, Details & Wager Limits

Diamond Charge Hold & Win is one of those online slots with a 5×4 gaming grid and 30 fixed paylines. Form winners by landing 3 or more matching symbols on consecutive reels, starting from the leftmost reel.

Stakes range between 10p and £50 per spin. If that looks limiting, you might want to turn to the best online slots for more accommodating bet levels. However, remember that bets cap at £5 if you’re playing at UK slot sites. There are also autoplay and quick spin modes for non-UK players.

The default Diamond Charge Hold & Win RTP is 95.1%, with 93% and 91% variants also widely available. Therefore, make sure to shop around the best Diamond Charge Hold & Win casinos for the top RTP value. If you’ve got eyes on higher return rates, check out our list of the best payout slots instead.

The volatility is on the high side here, which is quite surprising considering the rather classic gameplay. Furthermore, although the Diamond Charge Hold & Win max win of 5,000x the bet is satisfactory, it doesn’t exactly impress, particularly with the low max bet. It is well below what you stand to hit at progressive jackpot slots.

When I gave the Diamond Charge Hold & Win demo a go, my best win, 122x my stake, came in the Hold & Win round. You can find the demo version on this page or in our lineup of free online slots, so that you can try it for yourself.

Diamond Charge Hold & Win Theme—Hunt for Supercharged Diamonds

diamond charge hold and win slot base game

How many times have we seen Iron Dog Studio combine classic flair with more modern designs? Well, I’ve lost count—Fruit Coins Hold & Win and Mad Cabs Hold & Win are the quickest to come to mind.

In this game, the grid is supercharged, much like what we’ve seen in Games Global’s Gold Blitz™ Ultimate. It is set on a blue lightning background, which can be a bit distracting, pulling the attention away from the colourful gems on the reels. If you’re into modern aesthetics, you might want to sit this one out.

Just as I had anticipated, given the electric look, the audio has a heavy metal feel. Although it works well with the visuals, it’s rather too loud for me—I reached for the mute button after just a few spins.

See what the payable looks like:

Symbol Payouts/Info
diamond charge hold and win slot J symbolJ 3, 4, 5 = 0.4, 0.8, 5x the stake
diamond charge hold and win slot Q symbolQ 3, 4, 5 = 0.4, 0.8, 5x the stake
diamond charge hold and win slot K symbolK 3, 4, 5 = 0.4, 0.8, 5x the stake
diamond charge hold and win slot A symbolA 3, 4, 5 = 0.4, 0.8, 5x the stake
diamond charge hold and win slot blue gem symbolBlue Gem 3, 4, 5 = 0.6, 3, 30x the stake
diamond charge hold and win slot red gem symbolRed Gem 3, 4, 5 = 0.8, 4, 40x the stake
diamond charge hold and win slot green gem symbolGreen Gem 3, 4, 5 = 1, 5, 50x the stake
diamond charge hold and win slot diamond symbolDiamond 3, 4, 5 = 2, 10, 100x the stake
diamond charge hold and win slot wild symbolWild 3, 4, 5 = 2, 10, 100x the stake; substitutes for regular paying symbols
diamond charge hold and win slot collect symbolCollect Symbol Collects cash symbols

Diamond Charge Hold & Win Mobile Slot

diamond charge hold and win mobile slot

The high-voltage designs convert well in the Diamond Charge Hold & Win mobile slot without feeling too cramped. Everything from the game controls to the bet levels is responsive and within a thumb tap.

Performance-wise, I didn’t experience any lag even after playing at multiple mobile casinos. Moreover, the game successfully supports both landscape and portrait modes.

Diamond Charge Hold & Win Bonus Features

The bonus features in the Diamond Charge Hold & Win slot are not packed, but still worth chasing. The Hold & Win and the Cash Collect mechanics are the main attractions here.

Special Collector Symbol

The Collector symbol, represented by a yellow diamond, can appear only on reels 1 and 5. It collects the prizes on bonus symbols. If you are lucky enough to land 2 Collector symbols, you’ll collect the cash prizes twice.

See the bonus symbols and their values:

  • Special Bronze Coin Symbol: 0.5x, 1x, 1.5x, 2x the bet.
  • Special Silver Coin Symbol: 2.5x, 3x, 3.5x, 4x, 4.5x the bet.
  • Special Gold Coin Symbol: 5x, 6x, 7x, 8x, 9x the bet.
  • Special Prize Symbol: 10x (Mini), 20x (Minor), 50x (Major), 250x (Mega), 1,000x (Grand) the bet.

Hold & Win Round

diamond charge hold and win slot free spins

Landing 6 bonus symbols anywhere on the reels triggers the Hold & Win feature. The round starts with 3 respins, and only bonus and collector symbols can land on the reels. These symbols remain sticky and reset the respin counter each time they hit.

When the Collector symbol collects the prizes on bonus symbols, they are removed from the reels, giving room for more symbols to land. The round ends when you use up the awarded spins or fill up the grid, and then the collected prizes are awarded.

Coin Shower

Like we’ve seen in this provider’s other online slots, like 3 Plucky Hens and Inspector Wilds, this game also offers the Coin Shower feature. It can randomly throw 6 bonus symbols on the reels, triggering the Hold & Win round.

Bonus Buy (Unavailable in the UK)

Activate the Bonus Buy feature to move directly into the Hold & Win round. It costs 75x your stake.

Diamond Charge Hold & Win Verdict: Modest Gameplay That Lacks Exciting Features

2.4/5
Based on our expert’s review. Reviewed by
Diamond Charge Hold & Win Slot

The Diamond Charge Hold & Win slot game is well-executed, combining a classic look with modern designs. However, the gameplay lacks excitement and promising features—it’s unlikely to leave a lasting impression.

Pros
  • Offers a Hold & Win round
  • 5 fixed jackpots
Cons
  • RTP below the 96% average mark
  • £50 max bet
  • Gameplay lacks innovation and excitement
  • No free spins or multipliers

Diamond Charge Hold & Win feels like one of those online slots that knows its audience, and honestly, I don’t think I fit into that group. Iron Dog Studio continues to milk the Hold & Win mechanic, but at this point, it’s becoming less innovative by the day.

Most titles in the provider’s Hold & Win catalogue include familiar extras like free spins, spreading wilds, or multipliers, but we don’t get any of that here. The Hold & Win round is all that there is to look forward to. Besides, its hit frequency isn’t the most impressive—I had to wait well over 300 spins to trigger it.

On the bright side, the Collect symbol adds some promise to the gameplay. I was up to some decent payouts, particularly when 2 Collect symbols appeared simultaneously alongside big cash values. However, given the modest gameplay, it is hard to understand why the provider opted for high volatility on this one.

If you’re into classic titles inspired by gemstones, give Stepping Diamonds by Play’n GO a spin. It’s a retro fruit machine with a modern look, offering fixed jackpots and a max win of 4,000x the bet. You can also check out Rainbow Riches Leprechauns Gold by Barcrest and another Stakelogic gem, Crazy Tiki Hold & Win.

More Slots by Iron Dog Studio

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