Merlin's Riches Slot by RealTime Gaming

Two reels lock together on every base game spin. Whichever pair the game picks, they show identical symbol stacks top to bottom, and that synced-column behaviour is the whole base game. When Merlin lands on one of those matched reels he expands to cover the full four-row height, so a single wild drop becomes a fat vertical wall that pays across multiple lines at once. The rest of the grid runs normally - 25 fixed paylines, left to right, card ranks carved as medieval royal script in silver, premium portraits in octagonal panels for Arthur, Morgana, Excalibur, and a magic potion flask.

Three or more Red Dragon scatters open the Free Games round at 10 spins with a starting x2 Wild Multiplier. Each spin in the bonus guarantees one to three stacked Merlin wilds on the grid before the reels settle, which is where the multiplier earns its keep - it only applies to line wins that include a wild, and those wilds are arriving with every spin anyway. Any retrigger during the round adds three more spins and bumps the multiplier up by +1. There's an unusual gamble option the moment the round triggers: before the first free spin plays, the game offers you a chance to risk the round for more spins, climbing toward a 50-spin ceiling or crashing out with nothing. Most RTG slots don't gate their free games behind an all-or-nothing toggle like this.

A separate Bonus Game fires on three or more blue Sceptor symbols and drops to a 5x3 layout with its own multiplier meter climbing up to x500. That's a distinct second track, not a free spins variant. The green BUY FEATURE panel sits permanently on the left of the cabinet at 35x your stake - $8.75 at the minimum bet - for direct entry into the 10-spin bonus, skipping both the scatter hunt and the gamble offer. The backdrop is pure Camelot pageantry: blue-grey castle on the left cliff, a white waterfall cascading down the right, snow-capped peaks in the distance, the reels sitting inside ornate golden stonework. The 50,000x paper ceiling looks bright until you spot the fine print on some operator sheets capping single-spin exposure at 2,000x. If you want more medieval wizardry in the RTG library, Fortunate Zeus runs a different mythology angle, or try other expanding-wild builds for the same column-filling rush without the Arthurian set dressing.