Casino games developer iSoftBet is aiming to continue the St Patrick's Day celebrations with the release of a new Irish-themed slot title.

iSoftBet has designed Stacks O'Gold to stand out from the wide range of Irish-themed slots in the industry with a distinctive layout. Three of its five reels show three symbols each, with the other two showing four, allowing for 34 possible win lines.

The game's three-symbol reels transform into stacked wild reels at random, offering more chances for big wins. Three or more Stacks O'Gold symbols will award players with 15 free spins and launch a progressive bonus game in which players race to the end of a rainbow.

Each checkpoint passed on the journey to the end of the rainbow awards additional free spins, again helping increase the chance of securing a big jackpot.

"We wanted to mark St. Patrick's Day 2018 with a unique take on a popular theme," iSoftBet head of business development Michael Probert said of the new launch.

"While other providers tend to take it easy with seasonal titles, we know that players like to celebrate with a challenge," he said.

"So we paired our signature audio-visual excellence with a more unpredictable maths profile, and added unique mechanics that will keep players engaged even after the party is over."