Greentube Launches Highway to Bell: Stack & Collect

Greentube has launched Highway to Bell: Stack & Collect, a rock-themed slot now available to the studio’s B2B partners as of September 22, 2026. The game runs a 5-reel, 4-row grid with 20 fixed win lines, and we have a full Highway to Bell review covering every feature in detail.

Bell Collect and Mystery Bell Collect

Fireball symbols land on the reels carrying their own cash value, and when a Bell Collector symbol appears alongside them, the bell tolls and gathers every visible Fireball value into one payout. Mystery Bell Collect can trigger the same kind of collection at random, sending Fireball values to a giant bell mounted outside the reel area even without a Bell Collector symbol present on the grid.

Stack & Collect Bonus and Bonus Buy availability

The Stack & Collect bonus round introduces a new symbol type, Incrementer, which adds value to any Fireballs already on the grid before converting into one itself. Filling an entire reel with Fireballs lets that reel’s bell toll multiple times, locking in a multiplier as the round builds toward its top prize. A Bonus Buy option is available for direct entry into the round, though only in jurisdictions where that purchase mechanic is permitted.