Ultra Stack Feature Rose Slot Video - NICE BONUS!
The Ultra Stack Rose slot machine by Aruze is a clone of Ultra Stack Feature Panda!
First, to trigger the bonus you need at least one bonus symbol in reels 1, 2, and 3. Like other symbols in the game, bonus symbols are also "Super Stacked" and you have the chance to fill the entire screen with bonus symbols! Once triggered, each bonus symbol is then replaced by a number of free spins in the "Free Games Number Drawing" which are totaled giving you your final tally of free games.
50 "Top Symbols" are then added to the reels, although I'm not sure how large the reels are, so it may not have that much of an effect. Retriggers are possible, but difficult. All in all, hard to complain as I came out ahead, Enjoy!