Great Blue Slot
Great Blue: My Opinion
When you trigger the bonus with 3 or more scatter clam symbols, you pick two clams from five that awards you extra free spins and multipliers. By default, you get 8 free spins at 2x to start you off, but you can add up to an extra 25 spins and/or 15x in multipliers. If the stacked wild symbols appear in the free spins you can get pretty happy ;)
I normally find I end up with 15-18 free spins at 7x or 10x from the bonus feature. The worst you can get is either 33 spins at 2x or 15 spins at 7x so either way it is still pretty decent. I generally find the bonus ends up paying in excess of 40x your total bet if you get an extra multiplier which is better than most as averages go. It's unusual for it to pay less than 40x unless you don't get the multiplier in which case 20x is about the norm.
The Great Blue slot is a high variance slot (check out 300 Shields too if you like high variance games). It is also worth noting that Great Blue is very similar in gameplay to Playtech's 20-line Penguin Vacation , the lower variance 30-payline Irish Luck and the newer but slightly mundane-looking Marilyn Monroe slot so, if you like Great Blue's gameplay, then you'll probably appreciate those too.