Hellcatraz II Slot by Relax Gaming

The grid sits inside a brick prison block balanced on a rocky island, with the Golden Gate visible to the right and a smoggy city skyline to the left. Pixel-art seagulls perch on the top ledge, police boats marked P.D. patrol the water below, and a cartoon crab waves from the rocks. The whole presentation is deliberate 8-bit retro: chunky character symbols (a slick mobster in shades, a bald inmate with a phone, a fedora-wearing convict with an eye patch) sit alongside heart, spade, club and diamond pixel glyphs in the low-pay slots. It's the same visual language as the original 2020 Hellcatraz, just with a sharper roster of inmate sprites.

The headline mechanic is the Mystery Reveal Feature, and it's active on every spin. At least one Mystery Symbol always lands on the top row of the 5x5 grid, carrying a small numeric counter (1 to 5). Each winning cascade ticks that counter down by one. When it hits zero, the Mystery expands 2 to 5 positions upward and reveals identical symbols across all those tiles. Crucially, the reveal can be a regular paying icon OR a coin symbol worth anywhere from 1x to 1000x bet. That coin reveal is where the headline 10,000x cap actually comes from, because base-game line wins are intentionally modest to make room for it.

The reel expansion is what nudges this into proper Relax volatility territory. As the top row unlocks, the playfield grows and ways jump from 3,125 to as many as 59,049. Multiple Mystery Symbols on screen share the same counter unless one has already been triggered, so chains of reveals are possible on a hot board.

Three scatters land 6 free spins, and each extra scatter on the trigger spin adds 2 more. Scatters during the bonus retrigger 1 spin each. Mystery counters are tuned lower in the bonus, so reveals fire more often per spin. There's a Buy Feature at 70x the stake for direct entry, capped at 7,000 EUR on max bet. No ante bet option, no jackpot ladder - this is the base SKU, not the Dream Drop variant. If you want the urban-crime aesthetic without the progressive layer, this is the one.