Waves of Poseidon Slot by Pragmatic Play

A locked multiplier reel runs along the left edge of the grid, containing values up to 20x. It stays dark during normal play - consecutive tumbles push the multiplier higher, but it only activates when a BONUS symbol lands somewhere on the main grid. That BONUS symbol can also carry its own multiplier up to 50x, which compounds with the reel multiplier on any active wins.

Wins form through scatter pays - land 8 or more matching symbols anywhere on the 6x5 grid and they connect regardless of position. Each winning cluster triggers a tumble, clearing those symbols and dropping new ones in. The multiplier reel climbs with each tumble but resets once the cascade chain ends.

Four scatters trigger standard free spins (10 to 20 rounds) where the multiplier reel starts unlocked and BONUS symbols always carry multipliers. Six scatters push into Super Free Spins, where the multiplier reel carries over between spins without resetting. The difference between the two modes is significant - in Super, a multiplier built up over several tumbles on spin three still applies on spin four.

Two buy bonus tiers skip the scatter trigger: 100x for standard free spins, 500x for the Super variant. An ante bet toggle roughly doubles the stake to increase BONUS symbol frequency on the multiplier reel.