There are several great bonus features available in this slot. The main one is the Multiplier that appears on every single spin. On reels 3 and 4, you will spot two Multiplier symbols displaying two numbers each. One of these is a Multiplier, and the other is a Countdown. Every time you land a cascade win, the Countdown drops by one. If it gets to 0, the symbol will explode, and the Multiplier will be applied to the subsequent win.
The other main feature in the game is the Free Spins round. Whenever you land three or more of the Locked Chest Scatter symbols, you will be given 6 free spins. Three symbols reward 6 spins, and every Scatter after that, rewards one extra. During the Free Spins Round, any Multipliers from the Bonus symbols are persistent and will last the duration of the Free Spins Round.
If you want to skip the queue for the bonuses, then you can buy your way into the Free Spins Round by using the Buy Bet feature. This grants you access to the round for 100x your stake when playing for real money. Of course, this is quite a high amount, so you will have to weigh up whether you think it is worth it or not.