Thinking about giving 5-Line Bonus 21 a spin? We tested it thoroughly so you know what to expect. Greentube are the team behind it, tuning the release for a medium low volatility profile, with 95% RTP. Top wins are capped at 5,000x your stake, a healthy ceiling worth chasing. Dating back to 2023, it remains a regular pick. Visually it's wrapped in polished, characterful visuals, with the action running on 5 reels and 20 paylines. But is it actually worth playing? Read on.
Written by Alex Crawford · Last updated: March 2026
5-Line Bonus 21 is a game from Greentube. Presentation-wise it's finished with a clean, modern look, and it leans toward a medium low volatility profile at a return-to-player rate of 95%. Under the hood you'll find 20 paylines across 5 reels.
Where 5-Line Bonus 21 earns its keep is the feature set. Look out for scatter symbols that unlock free spins and extra bonus rounds. Thanks to its medium low variance, wins come often enough to suit casual, lower-risk play. On balance, 5-Line Bonus 21 is a dependable option worth a few spins in the demo first.
At 95%, the RTP is slightly below the industry average of ~96%. While this is typical for many popular slots, players should be aware of the slightly lower theoretical return.
Medium-low volatility offers a good balance of regular wins with occasional larger payouts. Expect frequent hits with modest amounts, suitable for casual players who want low-risk entertainment.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
5-Line Bonus 21 features scatter symbols that can trigger free spins rounds. Landing the required number of scatter symbols anywhere on the reels activates the free spins feature, giving you extra chances to win without additional bets. During free spins, special modifiers may apply to boost your winning potential.
3.0 / 5 — Good
5-Line Bonus 21 by Greentube is a solid offering that delivers good entertainment value. The 95% RTP combined with medium low volatility creates a well-balanced gaming experience.