Northern Temple Bonus Buy Slot by Evoplay

Each winning combination triggers a tumble that does two things at once: it removes the winning symbols and adds a new row to the grid. The reels start at 5x3 with 243 ways to win and can reach 5x6 with 7,776 ways during a single round. A win multiplier goes up by 1 with every cascade, starting at x1, and there's no ceiling on how high it climbs.

Coin symbols stick to the reels through the entire cascade sequence. If three or more coins remain on the grid after the last tumble, each one reveals a random value. Those values get multiplied by the current win multiplier, summed, then multiplied by the total bet. A long cascade chain that builds the multiplier to x8 or x10 before the coins pay out is where the big numbers come from.

Three Scatters on reels 2-4 award 15 free spins with one critical rule change: the win multiplier carries over between spins instead of resetting. An early cascade chain that pushes the multiplier to x5 means every subsequent spin starts there, and it keeps climbing. Scatters retrigger for another 15 spins.

The bonus buy costs 54x total bet for immediate access to 15 free spins. Wild symbols appear on reels 2-5 and substitute for everything except Scatters and Coins.