Reactoonz

Reactoonz pays for clusters of five or more matching alien symbols on a 7x7 grid, one of the larger boards among cluster slots, giving plenty of room for chains to develop. Every cluster win clears those symbols and drops new ones in, and certain symbol types can charge a Quantum Leap meter as they clear.

Filling that meter converts a random symbol type into wilds across the board, which can trigger a wave of new clusters in one go. At the highest charge level, the Gargantoon feature transforms the entire board into wilds and destroys them for one large combined payout.

Play'n GO rated this one high volatility given how much weight the Gargantoon feature carries, with a payout return of 96.5%.

Worth trying once you're comfortable with cluster formats and want a deeper feature set than Aloha! Cluster Pays or Moon Princess offer.

Quantum Leap charges build from specific symbol types clearing, not from every win equally, so some spins contribute more to the meter than others even at the same payout size. The alien character designs are unique to this title within Play'n GO's catalogue.

Because clusters can chain rapidly on a board this size, the base game rarely feels static even between the larger charge-triggered events. That constant low-level activity is a deliberate design choice by Play'n GO.