Game's features are:

CASCADE FEATURE: Symbols forming a winning combination disappear and then are replaced by other symbols coming from above. CASCADING will continue until no more winning combinations appear as a result of a CASCADE. Every CASCADE is a part of the current spin. All CASCADE wins are summed and credited after no new winning combinations are present on the reels.

WIN MULTIPLIERS: Multiplier symbols can appear on the reels during spins and CASCADE in both base game and FREE SPINS. Possible multiplier values on these symbols are:
x2, x3, x4, x5, x6, x8, x10, x12, x15, x20, x25, x50, x100, x250, x500.
When the CASCADE sequence ends, the multiplier values are summed and the total CASCADE win is multiplied by the final multiplier value.

FREE SPINS: 4 or more BONUS symbols award 15 FREE SPINS. When multiplier symbols appear and there is a winning combination on the reels, these multipliers are added to the TOTAL MULTIPLIER value. During the FREE SPINS, whenever a multiplier symbol appears and there is a winning combination, the TOTAL MULTIPLIER applies to that spin’s total win. If a Free spin doesn't include any multiplier symbols, the TOTAL MULTIPLIER won't apply. When 3 or more BONUS symbols appear on the reels, 5 additional FREE SPINS are awarded. Prizes for winning combinations during FREE SPINS are identical to the base game.

BUY FREE SPINS: The BUY FREE SPINS button allows the purchase of instant access to FREE SPINS mode for 100x current bet. This purchase automatically initiates a spin that triggers FREE SPINS mode.

EXTRA BET: The Extra Bet mode doubles chances to trigger FREE SPINS mode. With the Extra Bet mode active, the BUY FREE SPINS feature is disabled.