This is another Novel slot from Playtech casino systems. Great Blue has an underwater theme to it and although it does have large graphics which makes it look grand, the graphics aren't exactly cutting edge and the game play really doesn't compare to other more sophisticated slot machines.

There is a bonus game which triggers the free games using a choice method for you to select more free games and more multipliers. There is also a gamble feature for any win which you might make. One thing which does work in its favor is the bonus game is extremely high yielding in terms of bonus prizes. There is a possible 15 multiplier which can create massive wins.

Overall it is mediocre at best with no real punch for something that looks like it has potential. There are many better water themed slot machines out there to play.