Pirates' Plenty: The Sunken Treasure

Red Tiger built something clever back in 2019 — a slot that literally grows while you play it. Every map symbol you collect on the reels feeds a counter at the top of the screen. Once the counter hits 50, a sixth reel slides open on the right and the grid shifts from 5×3 to 6×3 for the rest of your session. The expansion isn't a timed bonus; once unlocked, it stays unlocked, and the Wild Ships start sailing in over the new column with x2, x3, or x5 multipliers stamped on each one.

Wild Ships only enter after the Treasure Reel is open, stacking across positions and dragging their multipliers into every payline they touch. The Wild Monkey, meanwhile, jumps onto the reels at random during base play, swings across the board, and substitutes broadly — covering several positions in one move and substituting for any paying symbol except scatters. It's the kind of feature that turns a quiet spin into a four-figure hit without warning.

Three scatters drop you into Ocean Spins, the free spins round, with 10 spins on the clock and treasure chests bobbing on the surface. Bronze chests turn card suits into wilds, Silver chests sprinkle multiplier wilds across the grid, and Gold chests transform entire reels into solid wild columns. Released in February 2019, Pirates' Plenty still ranks among Red Tiger's most-played fan favourites — high volatility, 95.07% RTP, 5,000x cap, and a progression hook nobody else has copied as cleanly.