Densho is a groundbreaking game, recognized for its beautifully dramatic Japanese art-style that stands out amongst other slot games.

Key Features and Mechanics of the game include:

- Exquisite Visual Artwork: Breathtaking Japanese-style aquarelle artwork forms the backdrop and changes dynamically during the game, creating an hypnotic and immersive aesthetic.

- Expanding Multiplier Wilds: The game includes expansive multiplier wilds with three different levels, offering varying multiplier levels to increase wins.

- Gameplay Structure: Wins are determined by landing 3 to 5 matching symbols across up to 10 paylines, starting from the leftmost reel towards the right.

- Reel Structure: The game is played on a 5 x 4 grid with a Wild symbol that can substitute for any pay symbol in the game.

- Paytable Symbols: The symbols include Samurai Warrior, Geisha Lady, Owl, Crane Bird, Sunset Bridge, 4 Japanese symbols, Mountains Wild, Koi Fish Scatter and different Densho Bird Wilds. Each symbol provides varying bet multiplier values.

- Wild Multiplier Reels: Densho Wild symbols, after landing, expand to fill the entire reel and come with a random multiplier value, depending upon their Densho level.

- Free Spins and Super Free Spins: Landing 3 Koi Fish Scatters triggers 10 free spins. The Super Free Spins round begins when you land 4 triggering scatters, providing 10 super free spins.

- Progression Meter: During the free spins round, a 3-dot progression meter becomes visible above each reel which tracks the level of Expanding Multiplier Wilds that can appear on each reel.

- Bonus Buy Option: Players can choose to buy extra bonuses that either increase the chance of triggering a Free Spins Round or guarantees a minimum number of Densho symbols per spin. This bonus option also allows the direct purchase of a regular or super bonus round.

- RTP and Volatility: Has a slightly above-average RTP of 96.33% and operates at the higher end of medium volatility. A potential max win is 10,000x your stake.

Overall, Densho is an immersive experience set apart by its compelling design and diverse features. Apart from the engaging game mechanics, the aesthetics make Densho a truly mesmerising gaming experience.