Rainbow Reels Slot by Pragmatic Play

Every position on the 5x4 grid sits on top of seven stacked layers of symbols. Land a winning combination, and the winning symbols are stripped away to expose the layer underneath. That second layer can form its own wins, which get stripped in turn, and so on down through all seven tiers. The deeper you dig, the more volatile the symbol mix becomes.

Three scatters anywhere on the reels open the free spins bonus, where the layered reveal system stays active. The real prize sits at the bottom: any symbol that reaches the seventh layer transforms into a wild. That wild sticks around for up to 13 winning evaluations before it disappears. If multiple positions hit layer seven at the same time, the entire board can fill with wilds for a single massive evaluation pass.

A buy feature at 100x total bet skips straight into free spins. There is also an instant bonus that can trigger randomly during play. The top regular symbol and the wild both pay 10x bet for five of a kind across the 40 paylines, so the base game leans on the layered chains rather than individual line hits for its bigger payouts.