Before we go into the Rainbrew Slots bonus, we should address the game format. This is a "ways to win" slot - but not as you might know it.
This is due to the slots unique reel design and the Sidewinder feature. Above and below the main reels, there are a set of horizontal reels.
During the base game, the only symbols in these reels are wilds - but they will only activate if a corresponding wild falls onto the reels.
The green Sidewinder reel, for example, will only start spinning when a green wild lands on the reels.
This is also true of the blue reel and the blue wild symbol. When these horizontal reels activate, they effectively add another row to the game, increasing the number of ways to win up to 1125.
Rainbrew slots also has a free spins feature - this will activate when a scatter symbol falls on reels 2 and 4. This will spin the Sidewinder reels - and if three more scatter symbols land, then free spins will activate.
During free spins, both wild and scatter symbols will spin in the Sidewinder reels. This means you can look forward to more ways to win in free spins.
If wilds align on each horizontal reel then the wild will expand to cover the entire reel. The game's biggest payouts are reserved for when all three central reels become wild.