Series
Butterfly Staxx series
Butterfly Staxx fixed the series' identity in 2017 when NetEnt paired a flower-and-butterfly setting with a 5x3 grid, 40 paylines, respins and multiplier-supported free spins. Its low-volatility profile made the feature cycle comparatively steady, while the wild, scatter and bonus-game structure kept the rules compact.
Ranked by Slot Score
| Game | Year | RTP | Volatility | Slot Score |
|---|---|---|---|---|
 Butterfly StaxxNetEnt | 2017 | 94.05% | Low volatility | 66 |
 Butterfly Staxx 2LatestNetEnt | 2019 | 96.35% | Medium volatility | 75 |
By 2019, Butterfly Staxx 2 had widened the grid to 5x4 and moved the listed volatility to medium without abandoning the 40-line base. Multiple reel sets, expanding and sticky wilds, respin wilds and a pick-object bonus give the sequel more ways to alter the screen after a trigger. The visual code stays close to the original, but the sequel shifts the series from a straightforward low-volatility slot toward a more feature-dependent game with greater state changes during bonus play.