The Auction House Slot by Betsoft

Rows of bidders in tuxedos and evening gowns line both sides of the grid, seated beneath arched balconies and crystal chandeliers. The reels sit inside an ornate golden picture frame against deep burgundy velvet, and the symbols match the setting - red vintage sports cars, an oil painting that looks like a Van Gogh, diamond necklaces on velvet busts, a pink gemstone, a white marble bust, and Faberge eggs in five different colors. The gavel is the Wild and also the highest-paying regular symbol at 200x for five, which is a nice touch thematically.

Gold coin Bonus symbols carry instant prize values between 1x and 500x. Three or more of them trigger a Hold and Win round with 3 respins, resetting to 3 each time a new coin lands. Fill all 20 positions and you're looking at serious accumulation, though the 10,000x cap applies regardless. Free Spins come in three tiers (5, 7, or 9 spins depending on scatter count), and Hold and Win can fire during them. Buying in skips the scatter hunt - 90x gets you 5 spins, 126x gets 7, and 160x buys the full 9. There's also a Random Wilds mechanic in the base game: if at least one Wild appears on a non-triggering spin, it can activate and scatter additional Wilds across the grid before wins are evaluated. Only one Wild activates per spin, so it's a modest boost rather than a reel-filler.

The Hold and Win coin values go up to 500x per individual symbol on a 20-position grid, which is where the 10,000x ceiling becomes reachable. But most coins will land at the lower end of that 1x-500x range, so the average bonus round plays out well below the theoretical max. The Random Wilds keep base game spins from feeling completely dead between feature triggers - land one gavel and there's a chance the game drops a few more before paying out.