Rainbow Reels slot adopts a classic Irish theme, and Pragmatic Play has taken a traditional approach to the design, sticking to familiar elements. The backdrop features the picturesque green hills of Ireland, while the reels showcase symbols commonly found in similar Irish-themed slots. To the right, a typical leprechaun character donned in a green tuxedo and top hat stands guard.

While Rainbow Reels doesn't break new ground with its theme, it does offer pleasing visuals and excellent graphics. The game's animations are smooth and of high quality, creating an engaging atmosphere. The accompanying music adds the final touch, enhancing the overall ambiance.

Rainbow Reels is played on a 5x4 reel set, providing 40 ways to win on each spin. The game features an innovative element with its 7-layer grid mechanic. This functions similarly to the Cascading Wins mechanic, where winning symbols are removed from the reels after a win. However, in Rainbow Reels, new symbols do not fall from above.

Instead, all other symbols remain in place, and the next layer beneath the winning symbol is revealed, containing a random symbol. Consecutive wins unveil further layers, continuing until no new wins occur or the final layer is reached, in which case the position remains empty.

The Rainbow Reels paytable consists of 11 symbols, categorized as high and low value. Low-value symbols are represented by traditional A-J card royals, while premium symbols include smoking pipes, beer mugs, horseshoes, shoes, top hats, and leprechauns. Winning combinations are formed by landing 3 or more identical symbols on consecutive reels, starting from the leftmost reel.

Betting in Rainbow Reels starts at £0.2 and goes up to £240, catering to a wide range of players. The game boasts high volatility and offers a maximum win of 5,000 times the bet. Rainbow Reels features three different RTP configurations: 96.07%, 95.05%, and 94%. Players should review the rules to select their preferred RTP before depositing.

The core of Rainbow Reels' gameplay revolves around the innovative Seven Layers mechanic. In the base game, there are no additional features. However, during free spins, the Seven Layers perks come into play.

Rainbow Reels free spins are triggered by landing 3 or more Scatter symbols on the reels. This not only initiates a round of 12 spins but also awards a cash prize of 2x, 10x, or 100x the bet when 3, 4, or 5 Scatters appear on the same spin. If another 3+ Scatters land during the bonus, players receive an additional 6 extra spins.

During free spins, the reels operate similarly to the base game, but with a significant difference. After reaching the 7th layer, the next symbol revealed is guaranteed to be a Wild. These sticky Wild symbols can contribute to multiple winning combinations on each spin, akin to the Unbreakable Wilds in Gonzo's Quest Megaways. Each Wild has a random counter that can range from 3 to 13, determining its duration on the reels.

Players have the option to instantly activate the free spins through the Buy Feature for a fixed cost of 100x the bet. This feature triggers a spin with a minimum of 3 guaranteed Scatters, allowing players to accumulate wins before entering the bonus round.

Rainbow Reels is accessible on any device, including desktop and mobile platforms. Players can enjoy the game on the go via their mobile browser or dedicated casino apps, with compatibility for both Android and iOS devices.