Great Blue Slot is a bonus video slot from PlayTech with 5 reels and 20 pay lines. The slot is all about Undersea World, the symbols are Sea Turtle, Shark, Whale, Seahorse, Starfish, Tropical Fish, Shells and Pearl. The symbols create 28 winning combinations. The bets range from $0.01 to $5 and the maximum bet is 200 coins per spin. The player has a chance to win up to 10,000 coins. The player can find all winning combinations in the Paytable. The game has the wild Whale symbol meaning that it substitutes for any other symbol, except for the scatter and bonus symbols, on the reels to create a winning combination. It also acts as the multiplier, in other words it doubles the sum of the prize. The game has the Shell scatter symbol. The scatter needn’t line up, it may be anywhere on the reels. Three scatters activate pick a box bonus game on the second screen. So you need to choose the items and then reveal the prize. You can win up to 33 free spins, moreover the sum of the prize will be increased up to 15 times. Every time you win you have a chance to gamble enlarging the sum of the prize, for it you need to guess the card colour.