Tesla's Invention

Tesla's Invention builds around a five-reel, three-row grid with 20 paylines. The core mechanic is an Electricity system: coil symbols land during base spins and accumulate charge, and when a specific trigger symbol lands, the coils discharge across the reels, converting adjacent symbols to wilds or multipliers.

The theming does not overstay its welcome. Reel symbols include Tesla-lab instruments, coils, capacitors, and card royals in a stylised Art Nouveau frame. The base game plays at a moderate pace, with coil charges building visibly across successive spins, giving the game a sense of progression that most base games lack.

Free spins arrive from three or more scatter symbols. The bonus round runs with a persistent coil charge that carries across all ten free spins, so late-bonus wins scale on the charge accumulated during earlier spins. This is the mechanic that earns Tesla's Invention its identity: a bonus round with a genuine build.

Max win of 10,000x stake is respectable for Relax Gaming's mid-tier catalogue. Volatility is high, with the usual caveat that reaching the ceiling requires the coil charge to be near maximum when a big cascade fires. Base game hit frequency is decent, and the visible coil charging gives even losing spins some narrative pull.