The reels stop, and there they are: two shimmering diamonds sitting in the bonus-trigger positions, plus BONUS and COLLECT symbols scattered across the grid. That combination is the moment everything in Supreme Diamond XXL becomes about respins rather than lines. It's worth walking through exactly what happens next, because this is a slot built almost entirely around one mechanic rather than a wide spread of features.
Getting oriented on the grid
Supreme Diamond XXL runs on a 5x3 layout with 15 fixed paylines, so there's no ways-pays sprawl or shifting reel count to learn. Gemstones, sevens and the game's diamond icons fill the reels, and the visual language is straightforward gemstone luxury rather than anything narrative. A spin plays out like any conventional slot until BONUS and COLLECT symbols start landing together, at which point the game pivots into its main draw: the Hold & Win Bonus Game. Bets run from $0.20 to $90 a spin, so the game accommodates both cautious testing and heavier stakes once a player has a feel for how often the trigger shows up.
What the Hold & Win Bonus Game actually does
Once triggered, the grid locks in place and every BONUS symbol showing at that moment displays a cash value, which might be a straight cash prize or one of the fixed jackpot tiers, Mini, Minor, Major or Grand. Up to five COLLECT SYMBOLS can then lock specifically onto reel two during the round. Each time a COLLECT symbol appears in a respin, it absorbs the value of every visible BONUS symbol on the board at that moment, adding those amounts to its own total. Every locked symbol resets the respin counter, so the round keeps extending as long as new BONUS or COLLECT symbols keep landing, and it ends only when the respins run dry with no new symbol appearing. The payout at the end is the sum of everything those collect symbols picked up during the sequence, which is where the 1,000x max win comes from.
The Super Bonus Game and other paths in
A second, rarer trigger leads into the Super Bonus Game, which works identically to the standard Hold & Win round except that it guarantees a minimum of three COLLECT SYMBOLS are already locked in place the moment it begins. That head start matters in a Hold & Win structure: starting with three collect symbols already active gives the round a real chance to snowball rather than fizzle after a couple of respins. Two additional systems can also lead a player toward triggering either bonus round: a Lucky Spin mechanic that can hand out entry directly, and a Diamond Metre that fills as regular spins are played and can activate the bonus game once it's charged. Both function as alternate doors into the same core feature rather than separate payout systems of their own.
Bonus Shop and where this slot sits
For players who don't want to wait on natural triggers, a Bonus Shop menu lets them buy direct access to either the standard Hold & Win round or the Super Bonus Game for a flat cost, deducted upfront in place of grinding base spins. It's a straightforward pay-to-play door into the feature, useful for session-based play where the goal is testing bonus frequency rather than working through base-game spins.
The stats line up with what the mechanic suggests: a 96.34% RTP and high volatility mean this is a slot that pays out in concentrated bursts rather than steady trickles, since much of its return is tied up in how big a Hold & Win round gets rather than in small base-game wins along the way. The 1,000x ceiling is modest against the multi-thousand-times max wins seen on some cluster-pay titles, but it's reachable given the guaranteed head start the Super Bonus Game provides. Newcomers to Hold & Win as a format will find this one of the cleaner entry points, since the mechanic isn't buried under wilds, multipliers or scatter-triggered free spins; it's just the collect-and-respin loop, laid out plainly across a 15-line grid.
Bottom Line
Whether Supreme Diamond XXL is worth your time depends on your tolerance for variance and how the theme reads to you. Players who want the slot's specific feature mix and accept the volatility profile will find consistent engagement here; players who prefer steadier, lower-ceiling action should look at lower-volatility alternatives. The math model and feature design tell you who this is for, the choice to spin is yours.
