The main bonuses in Troll’s Gold online are Hold & Spin respin features. The first of these is the Lock-in respins round. This occurs when you land three Stacked symbols on the first reel. When this happens, they will lock in place, and the reels will respin. During these respins, only matching symbols and Wilds will be available. Providing you one of these on the reels, the respins will continue. Filling the reels up will reward players with a payout of between 2x and 10x their total wager.
The second bonus feature offers the same concept, but it also brings much higher payouts. This is called the Treasure Trove respin round, and it launches when you land three Stacked gold bag symbols on reel one. The game then takes you deep into the gold mine where a respin round is launched. It has the same concept as the first round, except the only symbols on the reels, are a treasure chest and the gold bag. The maximum win here is much higher, though, with multipliers being added to a metre on the right-hand side of the screen. This is very similar to the base game in Money Cart 2, which was developed by Relax Gaming.
If you don’t like waiting around and want to get straight into the thick of it, you can buy your way into the Treasure Trove round using the Bonus Buy feature.