Greentube, the NOVOMATIC Digital Gaming and Entertainment division, has released Highway to Bell Stack & Collect™, a five-reel slot built on a hell-rock theme. Bells and fireballs fill the reels, with one more bell waiting just off the grid.
Collect mechanics
The game runs on five reels with 20 win lines, and two collect mechanics can activate independently during the base game. The bell collect fires when fireballs appear with the bell collector, ringing once per fireball and gathering each value before the total is paid. If fireballs appear without the collector, the mystery bell collect can step in at random, moving each value to the bell off the grid where it is gathered the same way. Since the triggers work separately, collections can land across many different base-game outcomes.
Bonus
Three microphone scatters on reels 1, 3, and 5 trigger the Stack & Collect™ bonus, which opens with three free spins. Every new fireball or incrementer resets the count and extends the round. Incrementers boost the value of fireballs already on the reels before becoming fireballs themselves. Once a reel is packed with fireballs, the bell overhead gathers their stacked values and adds a 3x multiplier.
A reel can pay out up to three times before it locks, edging the player closer to the grand prize. Two optional bet-up features are available: a bonus bet that raises the frequency of the stack and collect bonus trigger, and an inferno bet that lifts fireball rewards during play. The release follows Flaming Devil, which Greentube launched in August 2026.
Richard Ganster, Director of Games Strategy and Games Portfolio Management at Greentube, said:
The bell collect and mystery bell collect keep the base game rewarding on every spin, so players always have something to watch for.
The Stack & Collect™ is where the title really delivers.”
Locking in fireball values, reel by reel, and pushing toward the grand prize give players a clear sense of progression and a strong ceiling on win potential.’
