The Royal Express Hold and Win system operates as the central mechanic. It shifts the game play focus away from base game matches and directly toward the bonus game. This express hold trigger activates when gold coin bonus symbols land on reels one and three, paired with a locomotive collection (boost) symbol on reel two. Once the Royal Express hold mode begins, all coins stick to the grid, and three respins are awarded. The respin counter resets every time a new bonus or jackpot symbol appears during the sequence.
During the Hold and Win bonus, the boost symbol occupies the centre tile permanently, collecting instant cash values from every bonus symbol that lands. Players can also land jackpot icons that award one of the four fixed tiers: Mini, Minor, Major, or Grand. The Grand reaches the maximum 1,000x payout. Multiplier symbols (x1, x2, x3) may also appear, stacking on top of collected values to amplify the final award.
A practical observation from extended demo sessions: the bonus mode appears to trigger roughly once every 150 spins, which reinforces the high-volatility profile. That frequency might feel slow if you are used to slots that hit the bonus more regularly.