King Neptune is the wild symbol and he will substitute for all of the other symbols to help and form winning combinations.
The slot does not have a scatter symbol.
Every time that you land a winning combination on the reels, you trigger the Rising Respins feature. You win a free respin and an extra row is added to the reels. Each successive win adds another 10 paylines, so after six consecutive wins the game will have 7 rows and 70 paylines, making it far easier to land wins. Better yet, on the second, third and fourth spin the payout multiplier will increase to 2x, then 3x, and then 5x respectively. The feature then continues until you fail to land a win.
The Neptune wild symbol offers the top payout of 50 times the bet when five land along a payline. The kraken can payout up to 20 times the bet, the ship up to 18 times the bet, the goblet up to 16 times the bet, the swords up to 12 times the bet and the shield up to 10 times the bet. A and K can both payout up to 6 times the bet and the remaining symbols can payout up to 5 times the bet.