Hellcatraz

Hellcatraz is a video slot by Relaxgaming that plays out on a fixed 6×6 grid, delivering 46,656 ways to win. Its design leans heavily into retro 8-bit pixel art, with a textured Alcatraz prison island theme, dark waters, guard towers, inmates, sharks and handcuffs adding to the atmosphere. The base game uses cascading reels: winning symbols vanish and new ones fall into place, giving more chances for chains in the same spin. Mystery symbols appear each spin marked with a countdown number between one and five; each cascade reduces the counter by one, and when it reaches zero all mystery symbols reveal as the same regular symbol. Before spinning, players choose between two modes: Mixed Mode (high volatility) where mystery symbols can have two different counter values, or Lockdown Mode (super high volatility) where all mystery symbols share the same counter. There is a Key Collector meter: key symbols land on top of normal symbols and award 1-10 keys each, and collecting 2,000 keys triggers the Super Free Spins feature. In Super Free Spins you start with a number of spins; mystery symbols reveal immediately without waiting for cascades, and golden mystery symbols can appear: two golden mystery symbols plus two cascades will add extra spins. A Bonus Buy feature is included in many versions, allowing you either to purchase the full Super Free Spins round at a cost of 200 times your bet, or pay for the number of keys you still need to reach the 2,000-key total. The maximum win potential goes up to 51,840 times your stake.

You can play it for real money.