777 Surge is a volatile fruit machine inspired slot from Gameburger (powered by Microgaming), and it plays out on 5x3 reels with 20 paylines. The Mini Reel Bonus triggers when at least 3 mini slots land, and they come with prizes up to 2,000x your stake. You can get up to an x5 multiplier with you into the bonus round, and the overall max win is 6,000x your stake.

The premium symbols consist of single, double and triple flaming 7s, and they pay 5, 15 or 30 x your stake for 5 of a kind wins. Any combo of 7 symbols pays 2.5x your stake for the same, while the Wild symbol pays 30x your stake for 5-oak.

The wild also steps in for regular pay symbols to help complete winning combos, like wilds usually do.Landing 3+ Mini Reel Bonus Symbols triggers the Mini Reel feature, and each of the triggering mini slots will then spin one after the other.

The mini reels come with 3 reels and 1 payline, and they also come with 3 different colors that indicate the top prize. The top prize is won by landing three 7 symbols, and they are as follows:
The Orange Mini Reel top prize is 2,000x your stake.
The Purple Mini Reel top prize is 100x your stake.
The Blue Mini Reel top prize is 50x your stake.

You can also land smaller payouts up to 15x your stake from each of the mini reels, but most commonly you will get a mix of any symbols. This pays only 1x your stake. Landing 3 scatter symbols on reels 2, 3 and 4 triggers the Bonus Round, and you start by spinning the Free Spins and Multiplier Wheel.

You will thus get between 7 and 30 free spins, combined with a multiplier of x2, x3 or x5. The multiplier applies to all regular line wins, but it does not apply to Mini Reel payouts. You can retrigger the bonus round by landing 3 scatters, and this awards the same amount of free spins as you got initially.