Crystal Towers Slot Review – BTG's 3D Reactor Offers 90,050x Potential

Following closely on the heels of Big Bucks Deluxe—which introduced the Megapots jackpot system and a compelling 89,600x potential—Big Time Gaming returns with something entirely different. Crystal Towers trades the utilitarian Megaways layout for a 3D Cluster Pays experience that pushes the studio’s creative boundaries. Here’s how it plays when it comes out across BTG casinos on May 27th.

Base Game Features

Crystal Towers introduces a unique 5-row, 80-symbol setup shaped as a three-dimensional tower. Using the Cluster Pays mechanic—familiar from BTG’s Cyberslot Megaclusters and Star Clusters, and Play’n GO’s Reactoonz—wins are formed by landing five or more matching symbols horizontally or vertically. The tower’s multi-sided layout adds a literal twist, allowing clusters to wrap around edges and amplify chain reactions.

Each winning cluster triggers a collapse, with new symbols dropping in to fill empty spaces—keeping the action flowing and the potential growing. It’s a design that feels chaotic in the best way, with frequent cascades keeping players on edge. Just don't get your hopes up too much.

Free Spins Bonuses

Landing a Trigger Wild in a winning cluster unlocks the Free Spins round. You begin on a 6-row tower with 96 symbols, which expands spin by spin until it maxes out at 10 rows and 160 symbols. From the second spin onward, the game randomly adds up to 10 Wilds per spin, drastically increasing cluster potential and offering some of the most volatile spins BTG has put out in a while.

Unlike most games where the board resets each spin, only the bottom one or two rows are cleared here—giving the grid a sense of continuity and building toward truly monstrous clusters.

Game Mechanics & Wild Features

Wilds come in three flavours: Regular, Multiplier, and Trigger Wilds. Regular Wilds substitute to complete clusters, while Multiplier Wilds do the same but multiply the wins they’re involved in. Trigger Wilds activate Free Spins when they’re part of a win.

This layering of Wild functionality draws parallels to games like Max Megaways and Golden Catch, but Crystal Towers dials up the chaos by letting Wilds flood the board in later Free Spins. It’s not subtle, but it works.

Special Features & Bonus Buy

Short on patience? The Bonus Buy feature is your express ticket to the Free Spins round for 60x your stake. While there's no official note on how this affects RTP, BTG games typically balance Bonus Buys well. With a top payout of 90,050x, it’s a tempting gamble for anyone chasing huge returns.

Final Thoughts

Crystal Towers leans hard into innovation. The 3D layout might sound like a gimmick, but it adds genuine depth—both visually and mechanically. The Cluster Pays system, enhanced by persistent Wilds and a gradually growing board during Free Spins, makes this one of the more ambitious BTG releases since their Megaclusters experiments.

If you’re after narrative or theme, you won’t find much here—BTG keeps things sleek and functional. But if you’re the type of player who enjoys complex mechanics, high volatility, and the kind of win potential that makes your palms sweat, Crystal Towers is absolutely worth climbing.

Looking for more Cluster Pays action? Check out our reviews of Star Clusters, or even Play'n GO's Reactoonz for a taste of how this mechanic has evolved across studios.