Reactoonz 100 is a cluster-pay slot from Play’n GO featuring a dynamic 7×7 grid with no paylines. Wins are formed by connecting 5 or more identical symbols horizontally or vertically. After each win, symbols are removed and new ones fall into place, creating cascading reactions. Gameplay is built around cascades and a growing win multiplier. The multiplier increases with consecutive wins and is applied to clusters containing special Energized symbols. The slot uses a Quantum feature system. As winning symbols are collected, a meter fills and queues bonus mechanics. These activate once cascades end and can transform symbols into Wilds, remove groups of symbols, or change symbol types. The main feature is Gargantoon. It always triggers last and places multiple Wild symbols on the grid, which gradually merge into larger blocks, increasing grid coverage and win potential. Gargantoon cannot be an Energized symbol but does contribute to winning clusters. Additional mechanics include Instability and Fluctuation, which can add Wild symbols to the grid and enhance winning combinations under specific conditions. There are no separate free spins — all features are integrated into the base gameplay.