Rock Vegas Mega Hold & Spin Slot by Pragmatic Play

The name tells you what you're getting - cavemen, mammoths, and a saber-toothed tiger on one side, neon Vegas energy on the other. Reel Kingdom leaned hard into the cartoon Flintstones vibe, with stone-carved card symbols, torch-lit bamboo frames, and a shaggy caveman standing guard beside the reels. But the real draw is what happens when three golden Bonus rocks land anywhere on the 5x3 grid.

Normal symbols vanish. The grid expands to 10x10 - a hundred positions filled with nothing but rock symbols and empty spaces. Standard hold-and-win rules apply: rocks that land lock in place, each new rock resets the counter to 3 respins, and the round ends when respins run out or the entire grid fills. Where it gets unusual is Rolling Rocks. Two identical rock types forming a 2x2 cluster merge into a single big rock carrying a 5x to 10x multiplier on the combined value. Push that cluster to 3x3 and the multiplier jumps to 35x through 500x. So placement matters. You're watching adjacent positions, hoping matching colors line up rather than scatter randomly across the hundred cells.

A key collection trail runs alongside the respins. Some rocks land with a key icon attached, and collected keys travel along a track toward locked chests. Each chest awards one of five outcomes - a direct cash prize up to 500x, a random multiplier applied to an individual rock's value, a bundle of 4 to 10 extra keys, a retrigger that clears the board and starts fresh, or a general multiplier (2x to 100x) applied to your total win at the end. Multiple general multipliers stack multiplicatively. Past the chests, a Mystery Multiplier node adds another 2x to 100x that multiplies whatever general multiplier you've already built. The trail restarts after completion with no limit on loops. More Bonus symbols in the original trigger improve rock quality too - four removes the lowest-value green rocks, five strips it down to only orange, pink, and gold. Prehistoric dressing, but the bonus has genuine depth under all that cartoon fur and stone.