Bob Marlin Goes Deep Slot by Yggdrasil Gaming

Bob Marlin is the cartoon fisherman in yellow oilskins cranking a winch on a wooden dock to the right of the reels. The frame is a rope-wrapped fishing-trawler structure with a mounted blue marlin trophy at the top, four wooden tally crates on the left side counting fish caught, and a rippling underwater scene around it - jellyfish, kelp, and tropical fish drifting past the playable area. Yggdrasil shipped this in July 2025 as a low-volatility ways game, which is unusual for the studio's recent output.

Base play sits on a 5x4 board paying 1,024 ways. The Drill scatter only lands on reels 1, 3, and 5, and each one that drops pushes the reels down by a row for that spin alone. One drill makes it 5x5, two makes it 5x6, three makes it 5x7 and triggers the bonus on top of the expansion. Stacked symbol counts on a single reel multiply the ways math, so a fully drilled 5x7 spin runs at 16,807 ways before the round even resolves. The grid expansion is the engine of the whole game, since there's no Wild anywhere in the paytable.

The other half of the game is collecting fish. Four different collectible species can only appear on the new bottom rows that the drill exposes - so collection progress is gated entirely by how often Drills land. Each species has its own counter that fills to 5, and each completed counter fires a different 5-spin bonus tied to one of four Super High symbols. There are five free spin modes total: one regular Drill-triggered round at 10 spins on a permanent 5x7 grid, plus four collection-triggered rounds where the matching Super High pays from just 2-of-a-kind. The first collectible counter starts every session pre-filled to 3 of 5 as a session-opening hook, which is more generous than it sounds when you realise the other three counters are fully gated.

One quirk worth knowing about. Because the collection counters carry across stake changes, the bet for a Collection bonus is calculated as the AVERAGE of every bet you placed while filling that counter, not the bet on the trigger spin. Drop your stake during the grind and your bonus pays at the diluted average. Top exposure is 3,905x, which lines up with the low-vol math - this is the casual end of Yggdrasil's symbol-collection roster rather than a high-stakes hunter, and reviewers have already pointed out it doesn't push the saturated fishing genre anywhere new.