iSoftBet, the leading online games supplier and content aggregator, has released Nordic epic Thunder Shields, the first slot to feature a three-tiered jackpot within a ‘Hold and Win’ game.

The high production, action-packed Thunder Shields is iSoftBet’s fourth game to contain its highly popular Hold and Win mechanic, taking it to a new level with Booster Shields in the feature, Colossal Respins, Thunderstorm Prizes and Mystery Spins.

During base gameplay, a Hammer symbol acts not only as a Wild, but also triggers the Colossal Respin modifier, where giant symbols appear, covering up to four reels and leading to huge wins. The Mystery spins feature sees at least three reels land as stacked mystery symbols, which all reveal the same symbol for impressive win potential.

To trigger the Hold and Win Bonus, six or more Cash Shields need to land on the reels, awarding three respins. Every time a new shield lands, the respin counter resets. Thunder Shields’ Booster’s come into play during this mode, with different colour shields revealing a different modifier. This can be multiplier increases, collector shields to bank all money already on the board and clear it for more opportunities to win, as well as a Reel Boost, Cash Boost or Respins Boost, all of which further add to the thrill of battle during the Bonus Round.

Thunder Shields is the latest addition to iSoftBet’s growing slot offering, which has seen numerous Megaways in the supplier’s portfolio.

Mark Claxton, Head of Games at iSoftBet, said: “Thunder Shields sees our Viking warriors set sail on the high seas in search of treasure in our latest top performing Hold and Win game. Packed full of features, the bonus round has the potential to lead to massive wins.

“We’re thrilled with this title. We consistently strive to create unique content for a diverse range of demographics, and the development of our Hold and Win series of games has been a real point of pride this year.”