From Microgaming's Mermaid Millions to Ariana from the same developer, underwater-themed slot games have always proved popular with gamblers. It's a top theme for online casino software developers: it lends itself to luscious graphics, the animation can be decent, and the bonus games original.

One of the timeless additions to the genre is Playtech's Great Blue video slot. It's a cracking 5-reel online slot that features Stacked Wild symbols, a free spins bonus with multipliers, and lots of regular icons. In fact, after a couple of minutes surveying the paytable, one can see this is virtually identical to Playtech's Irish Luck slot. But does it deliver four-leaf clovers or a pot of rubbish at the end of the underwater rainbow? Let's find out.

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2. Play Slot for free Great Blue slot online is shown with an intro of marine tones and a relaxing musical thread. We are talking about a 25-pay line video slot created by the Playtech program. In Great Blue, we.
3. Great Blue is an online slot developed by Playtech that’s based on an underwater theme. The bonus round is triggered by landing 3, 4, or 5 of the scatter symbols anywhere in view and awards up to 25 free.
4. When you download a Playtech casino, if you like the Great Blue slot, check out Penguin Vacation and Irish Luck slots too - these have an identical free spins bonus to the Great Blue slot. Apart from the theme (obviously), the only real difference is the number of paylines.

In Great Blue, with 5 reels and 25 paylines, the theme is the world where a killer whale of the name Great Blue lives. Dive into the underseas space, and the Great Blue adventure begins. Play Free Great Blue Slot Online. There goes Great Blue.

Although it's looking a little rusty now, Great Blue still has some signs of (undersea) life. The game is played over five reels and three rows for a 25-payline set-up. Line bets can be set from 0.01 to 2.00 for a max bet of 50.00 per spin. There are also Auto Spins and Turbo Mode functions.

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The reels spin fairly well for an older slot, but the animation when you hit a winning payline is passable, especially if a Wild is involved.

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The low limit pays for punters are the 9-through-Ace symbols. You'll only need two 9s to earn a 2x-line bet win, but 5OAK (5 of a kind) gets you 100x. Only the A and K really pay better, with 150x achievable for 5OAK.

Keep an eye out for the yellow angel fish. This cutie will pay 400x for 5OAK, with the seahorse and starfish both paying 250x for the same winning payline. The shark and turtle are the best regular symbols and award for just two matching on the reels. You'll earn 2x for two of a kind, but a maximum 750x award for 5OAK is very good. Overall, though, this slot is fairly low-medium volatility given the types of wins we regularly racked up.

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The killer whale is this online slot's Wild symbol. Just two Wilds will get you a 10x win, but five Wilds will bag you 10000x. These Orcas will substitute all regular symbols in the game other than the Scatter bonus symbols. In addition, they double any wins they help complete (with the relevant payouts helpfully displayed in the paytable).

The Scatter symbol here is the oyster shell, baring its gleaming pearl for all to see. Just two Scatters gets you 2x, but five Scatters bags the gamblers a 500x prize. In addition, three or more Scatters anywhere will activate a free spins bonus game. You win up to 33 free spins with a multiplier of 1x-15x.

Like Irish Luck, you first have to choose from the clams/oysters on-screen. Each will contain extra free spins or a random multiplier to add to your haul. You begin the round with 8 free spins and a 2x multiplier anyway, so these are welcome additions. Like all the best Playtech bonus slots online, the free spins feature can be retriggered indefinitely.

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Great Blue can result in 'great' real cash hauls for punters, especially if you land stacked Wilds on Reel 1. We managed this 2 or 3 times out of our first 100 or so spins for a 10-11x total stake win.

But in most respects, this game is a virtual clone of Playtech's own Irish Luck. That online slot has a similar payout structure to this, as well as stacked Wild symbols and a free spins bonus with a 'Pick 'em' pre-bonus game to play first. It's hard to trigger as well, so in reality you're concentrating on making those Wilds pay as best you can.

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Great Blue has some big periods of volatility, especially if you don't a Wild Orca, but land the big underwater beast and you're looking at decent 2-4x total bet wins. Play for free today and see if the variance is on your side. Then take the plunge with a bankroll and play for real money.