The primary bonus is initiated by landing bonus symbols on reels 3, 4 or 5 or by landing the same symbol on all positions on reels 1 and 2, or the ultimate by doing both on a single spin! You are awarded 5 free spins unless you do both in which case you are awarded 15 free spins. In order to win, Big Money Burst symbols then need to land on adjacent reels from left to right, starting with reel 3! The Big Money Burst Feature is initiated by landing special symbols on reels 1 and 2 and if an additional symbol or two symbols also land, a multiplier of 2x or 3x is awarded for the feature.
You win in the base game by landing winning paylines although the real fun is with one of the special features of the game: Big Money Burst is the latest iteration in the classic Money Burst family of games and I have to say, it's a great one and has launched with two themes: Dean Martin and Buried Treasures.