The whale is the wild symbol and it can substitute for all the other symbols, except the scatter, to help and form winning combinations. Furthermore, it can land stacked and will double all wins to which it contributes.
The scatter symbol is a pearl in a pink shell and it offers scatter payouts of up to 500x the total bet for the spin.
If you can land three or more of the scatter symbols anywhere on the reels you are initially awarded eight free spins. However, before they begin you need to pick two of the five shells displayed and this will reward you with up to 33 free spins with a 15x multiplier. Best of all, the free spins can be retriggered indefinitely.
Great Blue offers a top payout of 10,000x if you can land five wilds across a payline. The shark and the turtle can both payout up to 750x, the seahorse and starfish can both payout up to 250x and the tropical fish can payout up to 400x. However, all these payouts can be doubled when combined with a wild symbol.