Big Time Gaming may produce high-quality games, but if there’s one thing they’re known for, it’s reinventing the slot machine format. This developer has done so with the hugely popular Megaways modifier, and in the case of the Millionaire Rush slot game, you’ll experience the Megaclusters system. In some ways resembling the mechanics of Slingo Originals games, the Millionaire Rush slot online’s Megaclusters showcase a Megatrail feature ladder to the left of the reels. The higher you climb up the ladder, the more modifiers you activate and the more exciting gameplay becomes. While the topmost rung brings you the biggest possible prize, it’s somewhere in the middle at Rung 7 where you can access the free spins. The Millionaire Rush online slot is a cluster-pays game, so forget about paylines in the meantime and focus instead on forming clusters of matching symbols made up of at least five of the same. These symbols in question consist of colourful gems, a popular choice for clusters. A wild can assist you in forming wins by substituting for other symbols. For every win in the Millionaire Rush slot machine, the Reactions mechanism is triggered. It functions like cascading reels, where winning symbols are replaced by new ones. However, the twist here is that for each symbol, four come along as a replacement, which expands the grid up to a maximum of 100 tiles. Add this in with the Megatrail ladder and its many surprises, and you’re lookin at a huge game that is jam-packed with features.