rng slotSo, what exactly are RNG slots? In layman’s terms, any slot game post-1980s is an RNG slot. Unlike their mechanical predecessors, RNG slots don’t rely on physical reels.At its core, a Slot Machine Random Number Generator, or RNG, is the dital brain that determines the outcome of every spin on a slot machine. It's the invisible force behind the flashing lhts and spinning reels.