123 Boom! (Relax Gaming) – Review & Demo Play

123 Boom!: Slot Overview

123 Boom! sets its pirate-themed action on a 5x4 grid with 1,024 ways to win. The Slot Slider lets me pick Slide Spin or Top Spin; flip the phone or hit Spin Mode and the grid rotates. In Slide Spin the reels move right to left and pays go left to right; Top Spin runs top to bottom and pays bottom to top. It sounds odd at first, yet after a few spins I settled in and stuck to Slide Spin most of the time.

Theme and Graphics in 123 Boom!

Surrounding the transparent reels sit two warring ships on a rolling sea, shown from a top down angle that suits the Slot Slider trick. The soundtrack brings up feelings of the high seas and ties the pirate theme together. I like how the grid stays clear while the background keeps the action lively without getting in the way. It looks clean in both orientations, though Top Spin can be a little disorientating until your eyes adjust.

Pay symbols lean into nautical gear: a ship's wheel, telescopes, maps, skull and crossbones, cutlasses, pistols, coins, and treasure chests. The premium pair are a lady pirate and a Blackbeard-looking chap. The mix fits the swashbuckling set-up and keeps wins easy to read in chains. In long Explosive Wins the screen pops in a tidy way, and the cannons on the sides frame the action when the bonus starts firing.

How to Play 123 Boom

Whichever mode I use, wins land when three or more matching symbols appear on adjacent reels; rows do not matter, giving 1,024 ways to win. Bets run from 10p to £50 across devices. I tend to spin in Slide Spin as it’s the most familiar view, switching to Top Spin on mobile now and then. If a session feels choppy, I toggle modes and pace the stake, then let the chain reactions do the heavy lifting.

123 Boom!: Slot Features

The cannonball symbol is wild and can land on any reel. If there is no win showing and no Cannonball Wild at the end of the reel, the wild slides in the direction of the spin. It blows up symbols one at a time until a win is formed or it reaches the edge. In practice, this often turns nothing into something, and I’ve had base spins saved by a single nudge of that sliding bomb. When it lands during features it keeps the grid active between reactions.

Explosive Wins work like reactions. Every winning combination explodes off the grid, and symbols then slide into the gaps. This can set off chains of consecutive wins from a single spin, carrying on as long as new combos line up. In Slide Spin the fills arrive from the right; in Top Spin they drop down and pay bottom to top. I’ve seen some tidy runs in the base game when a wild set the first pop off.

Three or more cannon scatters at the end of an Explosive Wins sequence trigger the Bonus feature. The number of scatters is collected. The first cannon fires a Cannonball Wild to start, then each stored scatter fires another when the current sequence ends. A progressive win multiplier is active, starting at x2 and rising by +1 after every Explosive Win. Up to 50 Explosive Wins per spin is possible, and extra scatters extend the round.

123 BOOM RTP and Variance

On the numbers side, 123 Boom! runs at 96.44% RTP with medium to high volatility. The hit rate sits around one in 3.5 spins, while the bonus dropped for me roughly in the 1 in 203 range, in line with the listed stats. Bets span 10p to £50, and the max win reaches 14,827x stake. Base play feels lively due to reactions, yet the bigger leaps tend to come when the multiplier stacks in the bonus.

123 Boom! Symbols and Paytable

The premium pictures are the lady pirate and the bearded captain, worth up to 20x for five of a kind, then stepping down through 5x and 3x bands. Mid symbols include treasure chests, coins, pistols, cutlasses, a map, a telescope and a ship's wheel, typically paying in the 3x to 1x to 0.5x range across five, four and three. It’s all paid on adjacent reels, so any row works across the 1,024 ways.

The cannonball is the Wild and substitutes on all reels. If no win is present and there is no Wild at the reel end, it can slide and blow symbols until a win forms or it reaches the edge. The cannon is the Scatter; land at least three by the end of an Explosive Wins sequence to trigger the Bonus feature. Payouts feel clear across both orientations, which helps when chains run long.

123 Boom! Symbols and Paytable

Symbol	Quantity	Payout
	5	x20
	4	x5
	3	x3
	5	x5
	4	x3
	3	x1.5
	5	x3
	4	x2
	3	x1
	5	x2.5
	4	x1.5
	3	x0.5
	5	x2
	4	x1.5
	3	x0.4
	5	x2
	4	x1.2
	3	x0.3
	5	x1.5
	4	x1
	3	x0.3
	5	x1.2
	4	x0.8
	3	x0.2
	5	x1
	4	x0.6
	3	x0.2
	5	x0.8
	4	x0.5
	3	x0.1
	Scatter
	Wild

123 Boom!: Slot Verdict

4ThePlayer has done something a bit different here. The Slot Slider modes can be a little disorientating at first, particularly Top Spin, but Slide Spin feels natural after a short spell. For me, the sliding wild often turns a dead spin into a payout, and that keeps the pace up in the base game. When you add reactions, it builds neat chains that set the table for bigger moments in the feature.

On paper the bonus reads like standard cascades with a progressive multiplier, yet in practice the cannon queue changes the rhythm. I’ve had rounds where the multiplier climbed well and the extra scatters kept things ticking. Some will adjust, others will be turned off by the unorthodox view, but the stats, transparency, and 14,827x potential make 123 Boom! worth a spin if you fancy something new that still plays fair.