4 Supershiny Diamonds: Hold and Win Slot Review

A gem-encrusted fruit machine where four different diamonds each bend the bonus round a different way. The reels themselves are old pub-slot furniture, red sevens and gold bells and BARs and cherries, spinning on a 5x3 grid with five fixed paylines. Everything modern happens above them.

Three coloured diamonds hang over the cabinet, violet Multi, blue Collect and green Charge, and any one of them drops you into a hold-and-win round shaped by whichever of them showed up. The gold Super Diamond is the fourth, and it is the one the title counts to: it opens a larger version of that round on reels that stretch to 5x5. Top prize is 15,000x the bet. Which is a separate number from the 10,000x Super Jackpot, the game's biggest single award but not its ceiling, and the two get run together constantly.

Black background, violet lightning forking behind everything, and a heap of loose coloured gems piled along the top edge of the reel frame like spoil from a mine cart. Three enormous cut diamonds sit on that heap with their names carved across them, and a fourth, much bigger and gold, burns behind and above the other three. Down the left edge five prize plates stack in tier colours, gold SUPER through red GRAND, green MAJOR, blue MINOR and purple MINI, each showing live cash rather than a multiplier.

The symbols are standard gloss: thick-outlined watermelon and grapes, a purple plum, a gold bell, a chunky gold BAR. Rendered well, but not designed for this game in particular. There is no setting and no story, just jewels under purple lightning, and the art has exactly one job, which is to make the diamonds above the reels look more important than the reels. That job it does. Anyone who has played Playson's other Hold and Win titles will still recognise every brushstroke.

The base game is a waiting room. Five fixed lines on a 5x3 with a top line pay of 50x means the fruit and the bells are there to fill time, not to build a balance, and the Wild is no help toward the thing you actually want. What the base game does do is dangle. Diamonds land there showing a cash value printed right on them and pay nothing at all, so you sit and watch a 3.00 diamond parked on reel five while the spin resolves for zero (either good tension or mild cruelty, depending on the day).

Then a round starts and the tempo flips. Three respins is not many, and the reset-on-every-new-symbol rule makes each one binary: something sticks and you carry on, or nothing does and you are two spins from the end. The jackpot plates rearrange into a countdown showing how many more Diamonds stand between the board and the Grand, a small touch that does a lot of work once the grid is half full.

What it will not do is stretch. A one-feature round on a board of 1.00 and 2.00 Diamonds is over in well under a minute, and that is probably the honest median here rather than the unlucky exception. Almost all the variance sits in whether features stack, and the Super Diamond is rare enough that plenty of sessions never see the 5x5 board.

The four-diamond idea earns its place. Playson has been shipping versions of this hold-and-win engine for years and most differ by one cosmetic layer, but stacking Multi, Collect and Charge inside a single round, then adding a fourth diamond that changes the size of the board, gives the bonus more shapes than these usually have. The Collect-after-Multi ordering in particular rewards paying attention to what lands when.

The cost is an RTP of 95.70%, under where most current releases sit, on a game whose main mode gives you little to do between bonuses. Anyone who knows 3 Supercharged Diamonds will find the same math block here on a bigger grid with a second bonus mode attached. And 100x is a steep way in when a bought round so often produces exactly one feature, so the Extra Bet at 1.5x is the slower but far kinder route.