Bone Raiders Slot by Relax Gaming

The 5x3 base reels sit on a sandy island plateau, ringed by a shallow water moat and chunky grey stone walls, with skeleton-pirate heads in horned helmets serving as the high-pay symbols and stone-carved card suits (heart, diamond, spade, club) handling the lows. A wooden "Multiplier" plaque hangs to the left of the grid, that's the meter you'll be watching.

Every paying spin in the base game kicks off a respin, and the global multiplier doubles each time. One win starts you at x2, the next respin pushes it to x4, then x8, x16, and the chain just keeps doubling until a respin lands empty. The accumulated multiplier applies to all wins in the chain, which is where most of the base-game variance comes from. Pay Ways evaluation runs left-to-right from the leftmost reel, and the Wild covers everything except the Bonus symbol.

The main event is the Bonus Game, triggered by three Bonus symbols landing on reels 2, 3, and 4. The grid then expands from 5x3 to a full 7x7, but only the central 3x3 is active at the start, the surrounding 40 positions are choked with Blockers. The three triggering symbols immediately convert into one of four feature symbols and play out their effects. Cannon fires at random tiles in 1, 4, 7, or all directions. Bomb detonates a 3x3, 5x5, or 7x7 area around itself. Compass targets a row, a column, one diagonal, both diagonals, or a row+column cross. Magic Staff (sometimes labelled Rapid) hammers a single symbol three, five, or seven times. Hitting a Blocker destroys it and opens that position; hitting a Coin doubles its value. After acting, the feature symbol drops to a 1x bet coin and stays on the board.

The bonus runs on a 2-spin counter that resets to its starting value every time a new feature symbol lands. Destroy 20 Blockers and the reset value bumps to 3. Destroy 20 more and it climbs to 4, which is the cap. So the longer you keep landing features, the more aggressive the clearance gets, and a fully opened 7x7 board with stacked coins is what chases the 10,000x ceiling. This is Relax Gaming reusing the blocker-clearance DNA of Money Train, but with an expanding grid instead of fixed reels and a pirate-skeleton wrapper instead of Wild West.

Skipping straight to the bonus costs 70x bet through the Buy Bonus button, which guarantees the Bonus Game trigger and runs at a slightly higher return than the base-game path. Worth knowing: with the multiplier respin chain stripped out of the equation, the buy is essentially betting on how clean the center 3x3 starts and how fast the features cascade outward.