Holy Diver Slot by Big Time Gaming

Fill the four-slot shield and the game stops to ask you a question. Chests drop onto the reels holding gems, and every gem revealed slides into a golden heraldic shield on the left, up to four at a time. Once all four are in, you decide: bank the free spins right now, or level up. Advancing widens the board and fattens the wilds, but it also puts your earned spins back on the line, so you're trading a guaranteed bonus for a bigger version of it.

That progression is the whole of the Reel Adventure, and it's a genuine Megaways engine underneath. Level one runs 117,649 ways with plain x1 wilds. Push to level two and the ways climb to 396,900 while every wild doubles. Level three tops out at 586,971 ways with x3 wilds, and the decision disappears there, filling the shield at level three sends you straight into free spins. Those spins play at whatever wild multiplier your level carried, x1, x2 or x3, then the board resets to level one to start the climb again.

Chests carry more than gems. One can plant up to three Full Reel Wilds, each stamped with a multiplier as high as x7. Another drops up to four Flaming Wilds, one per reel. A third turns every gem on reels two through five into an xN Wild. Wilds cover every symbol, so a stacked wild reel at level three, running the x3 base multiplier on top of a x7 chest wild, is where the top payout hides.

Prefer not to grind through the levels? You can buy in directly, and Feature Drop symbols landing in the base game shave the price down; a bought round also has a random shot at enhanced free spins. The look leans hard into the Dio track it borrows its name from: a gothic logo crowned with a purple gem, tall faceted jewels in purple, red, blue and green for the premiums, and a sky of bruised storm clouds over mossy grey crags. Dark-ages metal with a dungeon-crawler's appetite for leveling up.