Rotten Slot by Hacksaw Gaming

The Switch scatter is the engine. Land one in the base game and it triggers SwitchSpins - a respin set (anywhere from 1 to 10 spins) where selected symbols across the grid get swapped out for either the highest-paying symbol or wilds. More Switch symbols during the set expand the conversion pool and add respins, so what starts as a few replaced positions can snowball into a grid half-filled with premiums. Once the set ends, converted symbols reset to normal. It's a volatile burst mechanic, and on 35 fixed paylines across six reels, you need those converted symbols landing on the right lines to pay.

Two bonus rounds build on that foundation. Mad Scientist (110x buy, or land three FS scatters) gives 10 spins with Switch symbols appearing more frequently. Decent on its own, but the real escalation comes if three Total Takeover scatters show up mid-bonus - the round upgrades, resets your spin count to 10, and changes one rule: converted symbols no longer reset. Total Takeover (250x buy for direct entry) keeps every symbol replacement permanent. Each SwitchSpins set during the bonus adds to what previous sets already built. By spin 7 or 8, you can have half the grid locked into wilds and top-tier symbols that never revert. The symbol collection here feels genuinely progressive - you're accumulating a better grid, not just hoping for one lucky spin.

The setting is a derelict fairground overrun by the undead - a rusted carousel glowing orange on the left, wrecked buildings fading into fog on the right, and a gas-masked soldier standing guard at the edge of the reels. Premium symbols are portrait-style zombie heads in red and teal frames, each one distinct enough to tell apart at a glance. The horror cartoon style leans gritty but not gory, closer to comic book aesthetic than survival horror. Card royals fill the low end in a weathered serif font that fits the distressed military-lab vibe.