Crystal Towers (Big Time Gaming) – Review & Demo Play

Crystal Towers - Slot Overview

As soon as I loaded Crystal Towers, the three-dimensional Tower and cluster pays format were the talking points. Wins need at least five matching symbols linked horizontally or vertically, and clusters can wrap around the sides. Winning symbols are removed, reactions kick in, and new symbols drop from the top. In the base game the Tower is five rows high, holding 80 symbols, with each face five columns wide. Stakes run from 10p to £20, high volatility, and RTP sits at 96.36% (96.37% via buy).

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Symbols in Crystal Towers

Coloured cubes make up the seven paying symbols in Crystal Towers. Low clusters of five or six pay between 0.1x and 0.5x, while larger groups scale up to 3x to 5x the bet for 20 or more connected symbols. Cubes with subtle patterns are the premiums, which helps me track value at a glance when the Tower spins. With clusters able to wrap around edges and reactions chaining, those premium cubes can carry a round when they land together.

Crystal Towers Symbols and Paytable

Symbol	Quantity	Payout
	20+	x5
	17+	x5
	8+	x1.5
	7	x1
	5+	x0.5
	20+	x5
	17+	x5
	8+	x0.6
	7	x0.3
	5+	x0.3
	20+	x4
	17+	x4
	8+	x0.4
	7	x0.3
	5+	x0.2
	20+	x4
	17+	x4
	8+	x0.3
	7	x0.3
	5+	x0.2
	20+	x3
	17+	x2
	8+	x0.3
	7	x0.2
	5+	x0.1
	20+	x3
	17+	x2
	8+	x0.2
	7	x0.1
	5+	x0.1
	20+	x3
	17+	x2
	8+	x0.2
	7	x0.1
	5+	x0.1
	Wild, Multiplier

Wilds in Crystal Towers

Three wild types appear here: regular, multiplier, and trigger. All substitute for pays, but multiplier wilds apply the value shown on each participating symbol to the win, so stacking them can swing a reaction. In practice I saw modest clusters jump when a 2x or 3x joined the group. Because of the wrap-around geometry, a single wild can touch more than you expect, which keeps the next cascade interesting and adds a layer of volatility to routine base spins.

A trigger wild inside a winning cluster grants 10 free spins. If several trigger wilds are part of that same win, each one adds 10, but a lone trigger wild counted across multiple wins in a single reaction still totals 10. This rule matters when chains get long, as it stops quirky double-dips yet still rewards a stacked hit. The clarity helps me judge whether to chase an entry through reactions or hold for a cleaner screen.

In the base, multiplier wilds don't appear every spin, but when they do, the payout jump is obvious, even on mid-sized groups. I kept an eye on where a wild might drop after a reaction, as a single shift can connect two faces and pull a cluster through the edge. That's where the Tower design pays off; small wins can roll into something meaningful when a multiplier lands in the right lane at the right time.

Bonus Buy Feature

10 Free Spins You may buy 10 Free Spins for 60 times the Free Spins Stake.
Feature Cost:	x60 Bet
RTP:	96.37%
Volatility:	-

Free Spins in Crystal Towers

Free spins start on a taller Tower at six rows, holding 96 symbols. On spins three, five, seven, and nine, an extra row is added. The Tower can climb to a 10-row cap with 160 symbols, which changes how clusters connect across faces. The shifting height feels like a steady ramp rather than a random spike, giving a sense of progression as the bonus unfolds. The game breathes better as space opens up and reactions keep coming.

From the second free spin, only the bottom one or two rows are removed at the start, so more of the structure persists between spins. Also from spin two, up to 10 wilds are added in random positions before each spin, which can seed chains early. A trigger wild inside any win during the feature adds another 10 free spins. With the grid expanding on schedule and wilds injected regularly, the best runs often gather momentum rather than spike randomly.

Crystal Towers Bonus Buy

Buying into free spins costs 60 times your stake. The buy nudges RTP to 96.37% and skips the wait for a trigger wild, which suits me when balance and time are tight. It is still a highly volatile ride, so I treat it like a shot rather than a grind. On good entries, the early wild additions from spin two can set the tone fast, and the planned row increases give the sequence a proper arc.

Gallery of video and screenshots of the game