Mystery Mice Slot by Pragmatic Play

Every Wild that lands carries a random clearance level between 1 and 10. Each time that Wild participates in a winning cluster, the level drops by 1. As long as the level stays above zero, the Wild survives the tumble and drops downward as symbols above it get cleared. A Wild landing with level 8 sticks around for eight consecutive wins before finally exploding, growing more valuable with each tumble as it slides toward the bottom of the grid.

Clusters form from 5 or more identical symbols connected horizontally or vertically on the 6x6 grid. Winning symbols disappear, everything above falls, and new symbols fill from the top. Tumbles continue until no new cluster forms. Scatters survive tumbles regardless, and 3 or more trigger 8 free spins with 1x total bet paid per scatter.

Free spins change one rule: Wilds persist between spins instead of resetting. A Wild that survived tumbles on spin 1 is still there on spin 2, sitting lower on the grid with whatever clearance level it has left. The Power Up symbol appears exclusively during free spins and adds 1, 2, or 3 to the clearance level of every Wild currently on screen. Multiple Wilds stacking near the bottom of the grid after several spins creates a dense block that participates in cluster after cluster.

Retriggering works through scatters during the bonus - 2 or more award extra spins equal to the scatter count plus 1. The buy option at 100x bet skips straight to free spins from the base game.