Alien Invaders Slot by Pragmatic Play

Each spin deals 3 to 5 symbols per reel across a 5-column grid. The bottom row is what matters - land three or more matching symbols there, and every copy of that symbol on the activated reels counts toward a win. Those symbols then explode, and everything above tumbles down. New symbols fill the gaps, and the process repeats until no more matches form on the bottom row.

A win multiplier starts at 1x every spin and ticks up by 1 for every 10 symbols that explode during that spin's tumble chain. Wild symbols only show up on reel 3 and only pay when they reach the bottom row, but they carry their own multiplier - up to 25x in the base game. Scatters work differently too: when a scatter hits the bottom row, it blows up everything adjacent to it in all directions, clearing space for more symbols to fall.

Three scatters award 7 free spins, with 3 more for each extra scatter. During free spins, the win multiplier carries over between spins instead of resetting, and wilds can carry multipliers up to 100x. Two buy bonus tiers are available - 65x for standard free spins and 400x for an enhanced version. The ante bet bumps the stake by 25% for better scatter frequency.