Holmes and the Stolen Stones Slot by Yggdrasil Gaming

The shards stay collected after you close the game. That single design choice is the one to understand first, because it changes the relationship between casual sessions and the bonus trigger. Each of the five reels collects a shard in its own colour during base spins, and once you have five of any single colour the game drops you straight into Jackpot Free Spins with one diamond already pre-collected toward that reel's progressive pool. Quit at three blue shards and four red, log in next week, and the counter is exactly where you left it. Most slots reset everything on session close. This one explicitly does not, and the implication for jackpot hunting is significant - the trigger is something you build toward across many visits rather than something you chase on a single deposit.

The bonus round itself is short. Ten spins, no retrigger, every payline win multiplied by three. What you're actually doing in there is collecting diamonds, which fall in the same five colours as the shards. Five same-colour diamonds in a single ten-spin window awards the corresponding local progressive jackpot, and the diamonds wipe to zero between sessions. So the shard counter persists across logins, but the diamond counter inside Free Spins does not. Reseed values run from €40 on the smallest pool to €10,000 on the top one, and 3.4% of every base bet feeds the five pools at slightly different rates. Jackpot probability scales with bet size, and demo mode is locked out of jackpot eligibility entirely.

A second bonus runs in parallel. Three keyhole symbols open the Warehouse pick-game, where you crack boxes for coin awards (20, 40, 100, 200 or 1,000 coins), extra shards toward the colour collection, or a smoke bomb that ends the round. The smoke bomb is the only stop condition. The Warehouse cannot fire inside Jackpot Free Spins, so the two bonus paths never compete for the same trigger window.

One ceiling worth knowing about. The 600x non-jackpot cap only governs ordinary line wins, the Warehouse, and free-spin payouts. The five progressive jackpots sit outside that limit and pay separately, so the headline max-win number understates what the game can actually deliver to a player who lands the top pool. Visually the cabinet leans into Holmes-and-Watson detective noir, the deerstalker silhouette and Victorian gas-lamp tones giving the reels that hand-painted sepia-and-amber finish typical of Yggdrasil's earlier collection-style cabinets from the mid-2010s.