Mega888's Great Blue: Setup, Bonus Rounds and the Card Gamble
Great Blue is a marine-themed slot on Mega888 with a free spins round and a double-or-nothing card gamble. Here is how both work and how to play it safely.

Mega888 is a household name among mobile casino players, and Great Blue is one of the mini games people recommend on it. It is a marine-themed slot with a free spins round and a gamble option, and it is easy to learn.
The deep-sea theme
Great Blue is set in deep blue water. The graphics and sound effects are well made, and the symbols stick to the ocean idea: sharks, turtles and pearls. It looks good on a phone screen and never feels cluttered.
Getting set up on Mega888
- Download the Mega888 app. It is available for iOS and Android.
- Install it and create an account. You enter some basic information and choose a secure password.
- Log in and make your first deposit. Mega888 offers several payment options, so pick the one that suits you.
- Check the promotions. There may be a welcome bonus or other offer that adds credits. Read the terms first, since bonus credit usually comes with wagering requirements.
For more on the platform, see our Mega888 guides.
Read the paytable before you spin
With your account funded, open Great Blue. The layout is easy to follow for beginners and regulars alike. Before you press spin, look at the rules and paytable. They list the symbol values, the payouts and how each special feature is triggered.

Free spins and the card gamble
Great Blue has two features worth knowing about:
- Free Spins. Three or more scatter symbols trigger the round. Free spins give you more chances at a win without paying for each spin.
- Gamble. After a win you can try to double it by guessing the colour of a hidden card. It is a straight guess: get it right and the win doubles, get it wrong and it is gone.
The gamble is optional. If you have just landed a win you are happy with, collecting it is a perfectly sensible choice.

Use Mega888's limits and play responsibly
Set a budget and keep to it, and never chase losses. Mega888 provides tools to help, such as deposit limits and self-exclusion options. Set them up early, before you need them.
Great Blue is a pleasant underwater escape and it can pay out, but the house keeps its edge. If you want to try it, you can start playing Mega888 on 12Win.
Questions readers ask
How does the Great Blue gamble feature work on Mega888?
After a win you can try to double it by guessing the colour of a hidden card. Guess wrong and you lose that win.
How are free spins triggered in Great Blue?
Landing three or more scatter symbols triggers the Free Spins feature.
Does Mega888 have responsible gaming tools?
Yes. Mega888 provides tools such as deposit limits and self-exclusion options to help you manage your play.


